Almanac

import { sunEvents, sunAltitudeEvents, moonOrientation, starAltAz, nextLunarEclipse, lunarEclipseVisibility, nextSolarEclipse, nextGlobalSolarEclipse } from '@openwaters/almanac';

const observer = { latitudeDeg: 48.5, longitudeDeg: -123.0 };

// Sunrise, sunset, twilights and transit for the next 24 hours
const now = new Date();
const tomorrow = new Date(now.getTime() + 24 * 60 * 60 * 1000);
for (const { kind, time } of sunEvents(now, tomorrow, observer)) {
  console.log(kind, time.toISOString());
}

// Golden hour ends when the Sun rises through +6° and starts when it falls back
console.log(sunAltitudeEvents(now, tomorrow, observer, 6));

// Which way the Moon's lit side faces, in degrees from straight up
const moon = moonOrientation(now, observer);
console.log(moon.brightLimbAngleDeg - moon.parallacticAngleDeg);

// The next lunar eclipse, and whether you'll see it
const eclipse = nextLunarEclipse(now);
const visibility = lunarEclipseVisibility(eclipse, observer);
console.log(eclipse.kind, eclipse.peak, visibility.visibleAtPeak);

// The next solar eclipse visible from this location
const solar = nextSolarEclipse(now, observer);
console.log(solar.kind, solar.peak, solar.obscuration);

// The next solar eclipse anywhere on Earth, and where its shadow axis lands
const anywhere = nextGlobalSolarEclipse(now);
console.log(anywhere.kind, anywhere.peak, anywhere.latitudeDeg, anywhere.longitudeDeg);

// Where Sirius is right now, from its J2000 catalog position
console.log(starAltAz(101.287, -16.716, now, observer));

import Almanac
import Foundation

let observer = try Observer(latitudeDeg: 48.5, longitudeDeg: -123.0)

let now = Date()
let tomorrow = now.addingTimeInterval(24 * 60 * 60)
for event in try sunEvents(from: now, to: tomorrow, observer: observer) {
  print(event.kind, event.time)
}

print(try sunAltitudeEvents(from: now, to: tomorrow, observer: observer, altitudeDeg: 6))

let moon = try moonOrientation(at: now, observer: observer)
print(moon.brightLimbAngleDeg - moon.parallacticAngleDeg)

let eclipse = try nextLunarEclipse(after: now)
let visibility = try lunarEclipseVisibility(eclipse, observer: observer)
print(eclipse.kind, eclipse.peak, visibility.visibleAtPeak)

let solar = try nextSolarEclipse(after: now, observer: observer)
print(solar.kind, solar.peak, solar.obscuration)

let anywhere = try nextGlobalSolarEclipse(after: now)
if let latitude = anywhere.latitudeDeg, let longitude = anywhere.longitudeDeg {
  print(anywhere.kind, anywhere.peak, latitude, longitude)
}

let sirius = try starAltAz(raDeg: 101.287, decDeg: -16.716, at: now, observer: observer)
print(sirius.altDeg, sirius.azDeg)