Commit `05f6b6597a`

05f6b6597a468cb5e551b84fcdbb8ef06861f865

parent: 7efb6a812b

Unsigned

cmc <hello@cleberg.net> · 2026-10-18 22:13 UTC

v3: Live mission coverage (!40)

While a configured mission runs, the System tab shows a LIVE section: the craft's path between Earth and the Moon, mission time, phase and next phase, distances from Earth's and the Moon's centres, and Follow on the Lock Screen (a Live Activity, updated while the app runs).

* Server (deployed)
- =GET /v1/live[?at=ISO]=: the event running at =at= (default now) and its geocentric J2000-ecliptic trajectory up to then, [unix s, x, y, z] km every 30 min from JPL Horizons. Cached in feed_snapshots; refetched at most every 10 min while incomplete. No new cron.
- Horizons often has no data for the first hour or last minutes of a mission; its "No ephemeris prior to/after" reply is read and the request narrowed.
- =EVENTS= in server/src/live.ts holds Artemis I (2022) as a replay for testing. Adding a mission is an entry there plus a deploy.

* App
- =LiveCoverage= (Feeds), =SkyEngine.geocentricMoonEcliptic=, =LiveSection=, =EventLiveActivity=.
- Debug builds replay with the user default =liveReplayAt=.
- Tests: Horizons parsing and limits, event lookup, response decoding (saved replay fixture), and the Moon from Astronomy Engine within 3,000 km of Artemis I at closest approach (same frame as Horizons).

* Checked
- Replay at 2022-11-21 13:00 UTC on the simulator: 379,241 km from Earth, 2,563 km from the Moon's centre, phase "Outbound lunar flyby".
- Not checked: the Live Activity on a device; there is no live event now.

Layout: unified · split

App/Shared/EventActivity.swift added +16

		@@ -0,0 +1,16 @@
	1	import ActivityKit
	2	import Foundation
	3
	4	/// Live Activity for a mission covered live. Shared by the app and the widget extension.
	5	struct EventActivityAttributes: ActivityAttributes {
	6	struct ContentState: Codable, Hashable {
	7	var phase: String
	8	var next: String?
	9	var nextAt: Date?
	10	var distanceKm: Double
	11	}
	12
	13	var eventID: String
	14	var title: String
	15	var launch: Date
	16	}

App/Sources/LiveSection.swift added +138

		@@ -0,0 +1,138 @@
	1	import ActivityKit
	2	import Feeds
	3	import SkyEngine
	4	import SwiftUI
	5
	6	/// A mission being covered live: where it is between Earth and the Moon, its phase, and a Lock Screen follow.
	7	/// Shown only while the backend reports an event. In debug builds, the user default "liveReplayAt"
	8	/// (ISO 8601) replays a past event at that moment.
	9	struct LiveSection: View {
	10	var ink: Color
	11	var accent: Color
	12	@State private var coverage: LiveCoverage?
	13	@State private var following = false
	14
	15	private var replayAt: Date? {
	16	#if DEBUG
	17	UserDefaults.standard.string(forKey: "liveReplayAt").flatMap { try? Date($0, strategy: .iso8601) }
	18	#else
	19	nil
	20	#endif
	21	}
	22
	23	var body: some View {
	24	// A VStack rather than a Group: an empty Group has no view for .task to attach to.
	25	VStack(alignment: .leading, spacing: 0) {
	26	if let c = coverage {
	27	VStack(alignment: .leading, spacing: 10) {
	28	HStack {
	29	Text(replayAt == nil ? "LIVE" : "REPLAY").font(.caption2.weight(.bold)).tracking(0.8)
	30	.padding(.horizontal, 6).padding(.vertical, 2)
	31	.background(accent, in: RoundedRectangle(cornerRadius: 3))
	32	Text(c.event.title).font(.title3.weight(.medium))
	33	}
	34	EarthMoonMap(coverage: c, ink: ink, accent: accent)
	35	.aspectRatio(1, contentMode: .fit)
	36	.accessibilityLabel("Map of \(c.event.title) between Earth and the Moon")
	37	facts(c)
	38	if replayAt == nil {
	39	Button(following ? "Following on the Lock Screen" : "Follow on the Lock Screen") { follow(c) }
	40	.disabled(following)
	41	.font(.subheadline.weight(.medium))
	42	}
	43	Text("Trajectory: NASA/JPL Horizons, every 30 minutes.").font(.caption2).dimmed(0.5)
	44	}
	45	.padding(.bottom, 24)
	46	}
	47	}
	48	.task {
	49	while !Task.isCancelled {
	50	if let apiBase {
	51	do {
	52	let c = try await LiveCoverage.fetch(base: apiBase, at: replayAt)
	53	if let c {
	54	coverage = c
	55	await update(c)
	56	}
	57	} catch {
	58	log.error("live: \(error.localizedDescription, privacy: .public)")
	59	}
	60	}
	61	try? await Task.sleep(for: .seconds(600))
	62	}
	63	}
	64	}
	65
	66	private func facts(_ c: LiveCoverage) -> some View {
	67	let moon = SkyEngine.geocentricMoonEcliptic(at: c.at)
	68	let fromMoon = c.points.last.map { p in ((p.position - moon) * (p.position - moon)).sum().squareRoot() }
	69	let elapsed = c.at.timeIntervalSince(c.event.launch)
	70	return Grid(alignment: .leading, horizontalSpacing: 16, verticalSpacing: 6) {
	71	GridRow { Text("Mission time").dimmed(0.7); Text("\(Int(elapsed) / 86_400) d \(Int(elapsed) % 86_400 / 3600) h \(Int(elapsed) % 3600 / 60) m") }
	72	if let p = c.phase.current { GridRow { Text("Phase").dimmed(0.7); Text(p.label) } }
	73	if let n = c.phase.next { GridRow { Text("Next").dimmed(0.7); Text("\(n.label), \(n.at.formatted(date: .abbreviated, time: .shortened))") } }
	74	if let d = c.distanceKm { GridRow { Text("From Earth's centre").dimmed(0.7); Text("\(Int(d).formatted()) km") } }
	75	if let d = fromMoon { GridRow { Text("From the Moon's centre").dimmed(0.7); Text("\(Int(d).formatted()) km") } }
	76	}
	77	.font(.subheadline.monospacedDigit())
	78	}
	79
	80	private func state(_ c: LiveCoverage) -> EventActivityAttributes.ContentState {
	81	EventActivityAttributes.ContentState(phase: c.phase.current?.label ?? "", next: c.phase.next?.label, nextAt: c.phase.next?.at, distanceKm: c.distanceKm ?? 0)
	82	}
	83
	84	private func follow(_ c: LiveCoverage) {
	85	let attributes = EventActivityAttributes(eventID: c.event.id, title: c.event.title, launch: c.event.launch)
	86	_ = try? Activity.request(attributes: attributes, content: .init(state: state(c), staleDate: .now.addingTimeInterval(1800)))
	87	following = true
	88	}
	89
	90	/// Updates a followed activity while the app runs; ends it after the event.
	91	private func update(_ c: LiveCoverage) async {
	92	for a in Activity<EventActivityAttributes>.activities where a.attributes.eventID == c.event.id {
	93	following = true
	94	if c.at > c.event.end {
	95	await a.end(nil, dismissalPolicy: .default)
	96	} else {
	97	await a.update(.init(state: state(c), staleDate: .now.addingTimeInterval(1800)))
	98	}
	99	}
	100	}
	101	}
	102
	103	/// Earth at the centre, the Moon's orbit and position, and the trajectory so far, on the ecliptic plane.
	104	struct EarthMoonMap: View {
	105	var coverage: LiveCoverage
	106	var ink: Color
	107	var accent: Color
	108
	109	var body: some View {
	110	Canvas { context, size in
	111	let moon = SkyEngine.geocentricMoonEcliptic(at: coverage.at)
	112	let moonDistance = (moon * moon).sum().squareRoot()
	113	let farthest = coverage.points.map { ($0.position * $0.position).sum().squareRoot() }.max() ?? 0
	114	let scale = min(size.width, size.height) / 2 / (max(farthest, moonDistance) * 1.08)
	115	let c = CGPoint(x: size.width / 2, y: size.height / 2)
	116	func pt(_ v: SIMD3<Double>) -> CGPoint { CGPoint(x: c.x + v.x * scale, y: c.y - v.y * scale) }
	117
	118	let r = moonDistance * scale
	119	context.stroke(Path(ellipseIn: CGRect(x: c.x - r, y: c.y - r, width: 2 * r, height: 2 * r)), with: .color(ink.opacity(0.2)), style: StrokeStyle(lineWidth: 0.5, dash: [3, 4]))
	120	context.fill(Path(ellipseIn: CGRect(x: c.x - 5, y: c.y - 5, width: 10, height: 10)), with: .color(Color(red: 0.35, green: 0.6, blue: 0.95)))
	121	context.draw(Text("Earth").font(.caption2).foregroundStyle(ink.opacity(0.7)), at: CGPoint(x: c.x, y: c.y + 14))
	122
	123	let m = pt(moon)
	124	context.fill(Path(ellipseIn: CGRect(x: m.x - 4, y: m.y - 4, width: 8, height: 8)), with: .color(ink))
	125	context.draw(Text("Moon").font(.caption2).foregroundStyle(ink.opacity(0.7)), at: CGPoint(x: m.x, y: m.y + 13))
	126
	127	if let first = coverage.points.first, let last = coverage.points.last {
	128	var path = Path()
	129	path.move(to: pt(first.position))
	130	for p in coverage.points.dropFirst() { path.addLine(to: pt(p.position)) }
	131	context.stroke(path, with: .color(accent.opacity(0.8)), lineWidth: 1.2)
	132	let q = pt(last.position)
	133	context.fill(Path(ellipseIn: CGRect(x: q.x - 4, y: q.y - 4, width: 8, height: 8)), with: .color(accent))
	134	context.draw(Text(coverage.event.title).font(.caption2).foregroundStyle(accent), at: CGPoint(x: q.x + 7, y: q.y), anchor: .leading)
	135	}
	136	}
	137	}
	138	}

App/Sources/SystemScreen.swift +2

		@@ -26,6 +26,8 @@ struct SystemScreen: View {
26	26	Text("Solar system").font(.title.weight(.medium))
27	27	Rectangle().fill(accent).frame(width: 48, height: 5).padding(.top, 8).padding(.bottom, 16)
28	28
	29	LiveSection(ink: ink, accent: accent)
	30
29	31	// Labels in this dense diagram stop growing at xxLarge; the table below scales fully.
30	32	OrreryView(date: date, ink: ink, accent: accent)
31	33	.dynamicTypeSize(...DynamicTypeSize.xxLarge)

App/Widgets/EventLiveActivity.swift added +49

		@@ -0,0 +1,49 @@
	1	import ActivityKit
	2	import SwiftUI
	3	import WidgetKit
	4
	5	struct EventLiveActivity: Widget {
	6	private let ink = Color(red: 0.95, green: 0.95, blue: 0.93)
	7
	8	var body: some WidgetConfiguration {
	9	ActivityConfiguration(for: EventActivityAttributes.self) { context in
	10	VStack(alignment: .leading, spacing: 4) {
	11	HStack {
	12	Text(context.attributes.title).font(.system(size: 17, weight: .medium))
	13	Spacer()
	14	Text(context.attributes.launch, style: .timer).font(.system(size: 17, weight: .medium).monospacedDigit())
	15	.multilineTextAlignment(.trailing)
	16	}
	17	Text(context.state.phase).font(.system(size: 14))
	18	HStack {
	19	Text("\(Int(context.state.distanceKm).formatted()) km from Earth").font(.system(size: 12)).opacity(0.8)
	20	Spacer()
	21	if let next = context.state.next, let at = context.state.nextAt {
	22	Text("\(next) \(at, style: .relative)").font(.system(size: 12)).opacity(0.8).lineLimit(1)
	23	}
	24	}
	25	}
	26	.padding(16)
	27	.foregroundStyle(ink)
	28	.activityBackgroundTint(Color(red: 0.043, green: 0.078, blue: 0.141))
	29	} dynamicIsland: { context in
	30	DynamicIsland {
	31	DynamicIslandExpandedRegion(.leading) {
	32	Text(context.attributes.title).font(.system(size: 14, weight: .medium))
	33	}
	34	DynamicIslandExpandedRegion(.trailing) {
	35	Text(context.attributes.launch, style: .timer).font(.system(size: 14).monospacedDigit())
	36	}
	37	DynamicIslandExpandedRegion(.bottom) {
	38	Text("\(context.state.phase) · \(Int(context.state.distanceKm).formatted()) km").font(.system(size: 12)).opacity(0.8)
	39	}
	40	} compactLeading: {
	41	Image(systemName: "moon.stars")
	42	} compactTrailing: {
	43	Text(context.attributes.launch, style: .timer).font(.system(size: 12).monospacedDigit()).frame(maxWidth: 64)
	44	} minimal: {
	45	Image(systemName: "moon.stars")
	46	}
	47	}
	48	}
	49	}

App/Widgets/MoonriseWidgets.swift +1

		@@ -11,6 +11,7 @@ struct MoonriseWidgets: WidgetBundle {
11	11	PlanetsWidget()
12	12	#if os(iOS)
13	13	LaunchLiveActivity()
	14	EventLiveActivity()
14	15	#endif
15	16	}
16	17	}

PLAN.org +5 −1

		@@ -422,7 +422,11 @@ Sky, System, Sun, Launches, Library core (above).
422	422	months, 5 to 8 stops each, in Library/Resources/tours. Mission stories
423	423	done for Voyager 1 and 2, Pioneer 10 and 11 and New Horizons, on the orrery.
424	424	- Live coverage of major events (e.g. an Artemis landing) on the orrery
425		with a Live Activity.
	425	with a Live Activity. Done: GET /v1/live with a Horizons trajectory, an
	426	Earth–Moon map on the System tab and a Live Activity. Artemis I is configured
	427	as a past event for replay; add Artemis II and later missions to
	428	server/src/live.ts (Horizons ID, window, phases) once their Horizons IDs are
	429	published.
426	430	- Maybe: smart-telescope pointing (Seestar and similar).
427	431
428	432	* risks

Packages/MoonriseKit/Sources/Feeds/LiveEvent.swift added +64

		@@ -0,0 +1,64 @@
	1	import Foundation
	2
	3	/// A mission covered live by the backend (GET /v1/live): its phases and geocentric trajectory.
	4	public struct LiveCoverage: Sendable {
	5	public struct Event: Sendable, Decodable, Hashable {
	6	public struct Phase: Sendable, Decodable, Hashable {
	7	public var at: Date
	8	public var label: String
	9	}
	10
	11	public var id: String
	12	public var title: String
	13	public var launch: Date
	14	public var end: Date
	15	public var phases: [Phase]
	16	}
	17
	18	public struct Point: Sendable, Hashable {
	19	public var date: Date
	20	/// km, J2000 ecliptic axes, centred on Earth.
	21	public var position: SIMD3<Double>
	22	}
	23
	24	public var event: Event
	25	public var at: Date
	26	public var points: [Point]
	27
	28	/// The last phase that has started by `at`, and the next one.
	29	public var phase: (current: Event.Phase?, next: Event.Phase?) {
	30	(event.phases.last { $0.at <= at }, event.phases.first { $0.at > at })
	31	}
	32
	33	/// Distance from Earth's centre at the latest point, km.
	34	public var distanceKm: Double? { points.last.map { ($0.position * $0.position).sum().squareRoot() } }
	35
	36	private struct Response: Decodable {
	37	var event: Event?
	38	var at: Date?
	39	var points: [[Double]]?
	40	}
	41
	42	/// nil when no event is running.
	43	public static func decode(_ data: Data) throws -> LiveCoverage? {
	44	let d = JSONDecoder()
	45	d.dateDecodingStrategy = .custom { decoder in
	46	let s = try decoder.singleValueContainer().decode(String.self)
	47	if let date = try? Date(s, strategy: .iso8601) { return date }
	48	return try Date(s, strategy: Date.ISO8601FormatStyle(includingFractionalSeconds: true))
	49	}
	50	let r = try d.decode(Response.self, from: data)
	51	guard let event = r.event, let at = r.at else { return nil }
	52	let points = (r.points ?? []).filter { $0.count == 4 }.map {
	53	Point(date: Date(timeIntervalSince1970: $0[0]), position: SIMD3($0[1], $0[2], $0[3]))
	54	}
	55	return LiveCoverage(event: event, at: at, points: points)
	56	}
	57
	58	/// `at` replays a past event (testing); nil means now.
	59	public static func fetch(base: URL, at: Date? = nil, session: URLSession = .shared) async throws -> LiveCoverage? {
	60	var url = base.appending(path: "v1/live")
	61	if let at { url.append(queryItems: [URLQueryItem(name: "at", value: at.ISO8601Format())]) }
	62	return try decode(await session.data(from: url).0)
	63	}
	64	}

Packages/MoonriseKit/Sources/SkyEngine/SkyEngine.swift +8

		@@ -156,6 +156,14 @@ public enum SkyEngine {
156	156	return ecliptic(SIMD3(v.x, v.y, v.z))
157	157	}
158	158
	159	/// The Moon's geocentric position in km on J2000 ecliptic axes (as JPL Horizons gives with REF_PLANE ECLIPTIC).
	160	public static func geocentricMoonEcliptic(at date: Date) -> SIMD3<Double> {
	161	lock.lock()
	162	defer { lock.unlock() }
	163	let v = Astronomy_GeoMoon(time(date))
	164	return ecliptic(SIMD3(v.x, v.y, v.z)) * 1.495978707e8
	165	}
	166
159	167	/// J2000 equatorial to J2000 ecliptic axes.
160	168	static func ecliptic(_ v: SIMD3<Double>) -> SIMD3<Double> {
161	169	let e = 23.4392911 * Double.pi / 180

Packages/MoonriseKit/Tests/FeedsTests/Fixtures/live-artemis1.json added +1

		@@ -0,0 +1 @@
	1	{"event":{"id":"artemis-1","title":"Artemis I","horizonsId":"-1023","launch":"2022-11-16T06:47:44Z","end":"2022-12-11T17:40:00Z","phases":[{"at":"2022-11-16T06:47:44Z","label":"Launch"},{"at":"2022-11-21T12:44:00Z","label":"Outbound lunar flyby"},{"at":"2022-11-25T21:52:00Z","label":"Distant retrograde orbit"},{"at":"2022-12-01T21:53:00Z","label":"Leaves lunar orbit"},{"at":"2022-12-05T16:43:00Z","label":"Return lunar 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		\ No newline at end of file

Packages/MoonriseKit/Tests/FeedsTests/LiveEventTests.swift added +26

		@@ -0,0 +1,26 @@
	1	import Foundation
	2	import Testing
	3	@testable import Feeds
	4
	5	@Test func decodesLiveCoverage() throws {
	6	let json = Data("""
	7	{"event":{"id":"artemis-1","title":"Artemis I","horizonsId":"-1023","launch":"2022-11-16T06:47:44Z","end":"2022-12-11T17:40:00Z",
	8	"phases":[{"at":"2022-11-16T06:47:44Z","label":"Launch"},{"at":"2022-11-21T12:44:00Z","label":"Outbound lunar flyby"}]},
	9	"at":"2022-11-21T12:00:00.000Z","points":[[1668588420,-3171.3,10537.8,1526.1],[1669031220,300000,200000,10000]]}
	10	""".utf8)
	11	let c = try #require(try LiveCoverage.decode(json))
	12	#expect(c.event.title == "Artemis I")
	13	#expect(c.points.count == 2)
	14	#expect(c.phase.current?.label == "Launch")
	15	#expect(c.phase.next?.label == "Outbound lunar flyby")
	16	#expect(abs(c.distanceKm! - (300000.0 * 300000 + 200000 * 200000 + 10000 * 10000).squareRoot()) < 1e-6)
	17	#expect(try LiveCoverage.decode(Data(#"{"event":null}"#.utf8)) == nil)
	18	}
	19
	20	@Test func decodesLiveArtemisReplay() throws {
	21	// GET /v1/live?at=2022-11-21T13:00:00Z, saved 2026-10-18.
	22	let url = try #require(Bundle.module.url(forResource: "Fixtures/live-artemis1", withExtension: "json"))
	23	let c = try #require(try LiveCoverage.decode(Data(contentsOf: url)))
	24	#expect(c.points.count > 200)
	25	#expect(c.phase.current?.label == "Outbound lunar flyby")
	26	}

Packages/MoonriseKit/Tests/SkyEngineTests/EclipsePathTests.swift +9

		@@ -45,3 +45,12 @@ private func km(_ a: (lat: Double, lon: Double), _ b: (lat: Double, lon: Double)
45	45	#expect(madrid.obscuration > 0.8 && madrid.obscuration < 0.95)
46	46	#expect(LocalEclipse.at(Observer(latitude: 41.88, longitude: -87.63), near: peak) == nil) // Chicago: night
47	47	}
	48
	49	@Test func moonMatchesHorizonsFrame() {
	50	// Artemis I from JPL Horizons (geocentric, J2000 ecliptic, km) at 12:47 UTC on 21 November 2022,
	51	// ten minutes before its closest approach, about 130 km above the Moon.
	52	let craft = SIMD3<Double>(-337_632.7, -172_437.2, 9_689.0)
	53	let moon = SkyEngine.geocentricMoonEcliptic(at: Date(timeIntervalSince1970: 1_669_034_820))
	54	let d = ((craft - moon) * (craft - moon)).sum().squareRoot()
	55	#expect(d < 3_000)
	56	}

server/src/index.ts +34

		@@ -1,6 +1,7 @@
1	1	import { send, type ApnsConfig } from "./apns";
2	2	import { actionableKp, alertBands, eventKey, isNight } from "./aurora";
3	3	import { fetchElements } from "./celestrak";
	4	import { activeEvent, fetchTrajectory, STEP_MINUTES } from "./live";
4	5	import { fetchUpcoming, type Launch } from "./ll2";
5	6	import { digestDue, digestPayload, fetchLatest, localDate, pickHeadlines } from "./news";
6	7	import { PRIVACY_HTML } from "./privacy";
		@@ -62,6 +63,7 @@ export default {
62	63	return new Response(PRIVACY_HTML, { headers: { "content-type": "text/html; charset=utf-8", "cache-control": "public, max-age=3600" } });
63	64	if (request.method === "GET" && url.pathname === "/v1/today") return today(env, now);
64	65	if (request.method === "GET" && url.pathname === "/v1/launches") return launches(env, now);
	66	if (request.method === "GET" && url.pathname === "/v1/live") return live(env, url, now);
65	67	if (request.method === "GET" && url.pathname === "/v1/satellites") {
66	68	const row = await env.DB.prepare("SELECT fetched_at, body FROM feed_snapshots WHERE feed = 'celestrak' AND ok = 1").first<{ fetched_at: string; body: string }>();
67	69	return json({ fetchedAt: row?.fetched_at ?? null, satellites: row ? JSON.parse(row.body) : [] });
		@@ -113,6 +115,38 @@ async function sendTest(env: Env, token: string, now: Date): Promise<Response> {
113	115	return json({ apnsStatus: r.status, reason: r.reason }, r.status === 200 ? 200 : 502);
114	116	}
115	117
	118	/**
	119	* The live event at `?at=` (default now) and its geocentric ecliptic trajectory up to then:
	120	* points are [unix seconds, x, y, z] km. The cached trajectory is refreshed from Horizons at most
	121	* every 10 minutes while the event runs.
	122	*/
	123	async function live(env: Env, url: URL, now: Date): Promise<Response> {
	124	const atParam = url.searchParams.get("at");
	125	const at = atParam ? new Date(atParam) : now;
	126	if (Number.isNaN(at.getTime())) return json({ error: "invalid at" }, 400);
	127	const event = activeEvent(at);
	128	if (!event) return json({ event: null });
	129
	130	const key = `live:${event.id}`;
	131	const row = await env.DB.prepare("SELECT fetched_at, body FROM feed_snapshots WHERE feed = ?1 AND ok = 1").bind(key).first<{ fetched_at: string; body: string }>();
	132	let points: number[][] = row ? JSON.parse(row.body) : [];
	133	const covered = (points.at(-1)?.[0] ?? 0) * 1000;
	134	const wanted = Math.min(now.getTime(), Date.parse(event.end)) - 2 * STEP_MINUTES * 60_000;
	135	const stale = !row \|\| points.length === 0 \|\| now.getTime() - Date.parse(row.fetched_at) > 10 * 60_000;
	136	if (covered < wanted && stale) {
	137	try {
	138	const fresh = await fetchTrajectory(event, now);
	139	if (fresh.length === 0) throw new Error("no Horizons data");
	140	points = fresh;
	141	await env.DB.prepare("INSERT INTO feed_snapshots (feed, fetched_at, ok, body) VALUES (?1, ?2, 1, ?3) ON CONFLICT (feed) DO UPDATE SET fetched_at = ?2, ok = 1, body = ?3")
	142	.bind(key, now.toISOString(), JSON.stringify(points)).run();
	143	} catch (e) {
	144	console.error("horizons", String(e));
	145	}
	146	}
	147	return json({ event, at: at.toISOString(), points: points.filter((p) => p[0] * 1000 <= at.getTime()) });
	148	}
	149
116	150	async function launches(env: Env, now: Date): Promise<Response> {
117	151	const since = new Date(now.getTime() - 6 * 3600_000).toISOString();
118	152	const rows = await env.DB.prepare("SELECT * FROM launches WHERE net >= ?1 ORDER BY net LIMIT 20").bind(since).all<Record<string, unknown>>();

server/src/live.ts added +83

		@@ -0,0 +1,83 @@
	1	// Live coverage of a crewed or lunar mission: its trajectory from JPL Horizons, cached while the event runs.
	2	// To cover a new mission, add it to EVENTS (Horizons ID, window, phases) and deploy.
	3
	4	export interface LiveEvent {
	5	id: string;
	6	title: string;
	7	/** Horizons COMMAND, e.g. "-1023" for Artemis I. */
	8	horizonsId: string;
	9	/** ISO 8601 UTC. */
	10	launch: string;
	11	end: string;
	12	phases: { at: string; label: string }[];
	13	}
	14
	15	export const EVENTS: LiveEvent[] = [
	16	{
	17	// Past mission, kept for testing with /v1/live?at=2022-11-21T12:00:00Z.
	18	id: "artemis-1", title: "Artemis I", horizonsId: "-1023",
	19	launch: "2022-11-16T06:47:44Z", end: "2022-12-11T17:40:00Z",
	20	phases: [
	21	{ at: "2022-11-16T06:47:44Z", label: "Launch" },
	22	{ at: "2022-11-21T12:44:00Z", label: "Outbound lunar flyby" },
	23	{ at: "2022-11-25T21:52:00Z", label: "Distant retrograde orbit" },
	24	{ at: "2022-12-01T21:53:00Z", label: "Leaves lunar orbit" },
	25	{ at: "2022-12-05T16:43:00Z", label: "Return lunar flyby" },
	26	{ at: "2022-12-11T17:40:00Z", label: "Splashdown" },
	27	],
	28	},
	29	];
	30
	31	export const STEP_MINUTES = 30;
	32
	33	/** The event whose window contains `at`, if any. */
	34	export function activeEvent(at: Date, events = EVENTS): LiveEvent \| undefined {
	35	return events.find((e) => Date.parse(e.launch) <= at.getTime() && at.getTime() <= Date.parse(e.end));
	36	}
	37
	38	/** Horizons rows from a CSV vector table (VEC_TABLE 1): [unix seconds, x, y, z] km. */
	39	export function parseVectors(result: string): number[][] {
	40	const start = result.indexOf("$$SOE"), stop = result.indexOf("$$EOE");
	41	if (start < 0 \|\| stop < 0) return [];
	42	return result.slice(start + 5, stop).trim().split("\n").map((line) => {
	43	const f = line.split(",").map((s) => s.trim());
	44	const jd = Number(f[0]);
	45	return [Math.round((jd - 2440587.5) * 86400), Number(f[2]), Number(f[3]), Number(f[4])];
	46	}).filter((r) => r.every(Number.isFinite));
	47	}
	48
	49	/**
	50	* The limit in Horizons' "No ephemeris for target ... prior to A.D. 2022-NOV-16 08:46:00.3328 TDB"
	51	* (or "after A.D. ...") reply.
	52	*/
	53	export function ephemerisLimit(result: string, which: "prior to" \| "after"): Date \| undefined {
	54	const m = result.match(new RegExp(`${which} A\\.D\\. (\\d{4})-([A-Z]{3})-(\\d{2}) (\\d{2}):(\\d{2})`));
	55	if (!m) return undefined;
	56	const month = ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"].indexOf(m[2]);
	57	return new Date(Date.UTC(Number(m[1]), month, Number(m[3]), Number(m[4]), Number(m[5])));
	58	}
	59
	60	/**
	61	* Geocentric positions on J2000 ecliptic axes from launch to `until`, every STEP_MINUTES. Horizons data
	62	* for a spacecraft usually starts after launch and may end before the event does; the request is
	63	* narrowed to what Horizons says it has.
	64	*/
	65	export async function fetchTrajectory(e: LiveEvent, until: Date, from = new Date(e.launch), to = new Date(e.end)): Promise<number[][]> {
	66	const start = from;
	67	const stop = new Date(Math.min(until.getTime(), to.getTime()));
	68	if (stop <= start) return [];
	69	const fmt = (d: Date) => d.toISOString().slice(0, 16).replace("T", " ");
	70	const params = new URLSearchParams({
	71	format: "json", COMMAND: `'${e.horizonsId}'`, EPHEM_TYPE: "'VECTORS'", CENTER: "'500@399'", REF_PLANE: "'ECLIPTIC'",
	72	START_TIME: `'${fmt(start)}'`, STOP_TIME: `'${fmt(stop)}'`, STEP_SIZE: `'${STEP_MINUTES}m'`,
	73	VEC_TABLE: "'1'", OUT_UNITS: "'KM-S'", CSV_FORMAT: "'YES'", OBJ_DATA: "'NO'", MAKE_EPHEM: "'YES'",
	74	});
	75	const res = await fetch(`https://ssd.jpl.nasa.gov/api/horizons.api?${params}`, { headers: { "user-agent": "moonrise-server (sh.krz.moonrise)" } });
	76	if (res.status !== 200) throw new Error(`Horizons ${res.status}`);
	77	const result = ((await res.json()) as { result: string }).result;
	78	const first = ephemerisLimit(result, "prior to");
	79	if (first && first > from) return fetchTrajectory(e, until, new Date(first.getTime() + 60_000), to);
	80	const last = ephemerisLimit(result, "after");
	81	if (last && last < stop) return fetchTrajectory(e, until, from, new Date(last.getTime() - 60_000));
	82	return parseVectors(result);
	83	}

server/test/live.test.ts added +27

		@@ -0,0 +1,27 @@
	1	import assert from "node:assert/strict";
	2	import { test } from "node:test";
	3	import { activeEvent, ephemerisLimit, parseVectors } from "../src/live.ts";
	4
	5	test("finds the event covering a time", () => {
	6	assert.equal(activeEvent(new Date("2022-11-21T12:00:00Z"))?.id, "artemis-1");
	7	assert.equal(activeEvent(new Date("2022-12-12T00:00:00Z")), undefined);
	8	assert.equal(activeEvent(new Date("2026-10-18T00:00:00Z")), undefined);
	9	});
	10
	11	test("parses a Horizons CSV vector table", () => {
	12	// Excerpt of a Horizons VECTORS result for Artemis I, 2022-11-20, VEC_TABLE 1.
	13	const result = `header\n$$SOE\n2459903.500000000, A.D. 2022-Nov-20 00:00:00.0000, -3.304975631098540E+05, -1.579881350142587E+05, 1.186979134120867E+04,\n2459903.750000000, A.D. 2022-Nov-20 06:00:00.0000, -3.342673908331381E+05, -1.637787996887478E+05, 1.148822953490770E+04,\n$$EOE\nfooter`;
	14	const rows = parseVectors(result);
	15	assert.equal(rows.length, 2);
	16	assert.deepEqual(rows[0], [1668902400, -330497.563109854, -157988.1350142587, 11869.79134120867]);
	17	assert.equal(rows[1][0] - rows[0][0], 6 * 3600);
	18	});
	19
	20	test("reads the start of Horizons data from its error", () => {
	21	const msg = 'No ephemeris for target "Artemis 1 (spacecraft)" prior to A.D. 2022-NOV-16 08:46:00.3328 TDB';
	22	assert.equal(ephemerisLimit(msg, "prior to")?.toISOString(), "2022-11-16T08:46:00.000Z");
	23	assert.equal(ephemerisLimit(msg, "after"), undefined);
	24	const end = 'No ephemeris for target "Artemis 1 (spacecraft)" after A.D. 2022-DEC-11 17:21:01.8003 TDB';
	25	assert.equal(ephemerisLimit(end, "after")?.toISOString(), "2022-12-11T17:21:00.000Z");
	26	assert.equal(ephemerisLimit("$$SOE ... $$EOE", "prior to"), undefined);
	27	});

Commit 05f6b6597a

Commit `05f6b6597a`