ISO week 51 2027
This week is currently in preparation and will be published as part of the Star Almanack.
Week begins: Monday, December 20, 2027
Notation:
Calendar
| Date | Zodiac day | Events |
|---|---|---|
| Mon, Dec 20, 2027 | ♐ 29 | 🌗 Last Quarter — 09:10:55 UTC β For —  V 4 — Southern Autumn |
| Tue, Dec 21, 2027 | ♐ 30 | |
| Wed, Dec 22, 2027 | ♑ 1 |  Ursids peak · radiant in Ursa Minor · expected ZHR ≈ 10 · Moon 25% illuminated: moderate moonlight interference · Use a dark site, allow 20–30 minutes for dark adaptation, and observe with the unaided eye. Watch a broad area of sky rather than staring directly at the radiant.♑ Sun enters Capricorn · Winter solstice · Yule — 02:42:10 UTC β Hor — V 5 — Southern Winter |
| Thu, Dec 23, 2027 | ♑ 2 | Menkar (α Cet) —  V 3 — Tropical Winter |
| Fri, Dec 24, 2027 | ♑ 3 | Algol (β Per) — V 2 — Northern WinterIC 289, PN G138.8+02.8, planetary nebula in Cassiopeia —  V 12 — Finest NGC — Northern WinterNGC 1232, galaxy in Eridanus — V 10.6 — Finest NGC — Tropical Winter |
| Sat, Dec 25, 2027 | ♑ 4 | Dalim (α For) — V 4 — Southern WinterC87, NGC 1261, globular cluster in Horologium — V 8.4 — Southern Winter |
| Sun, Dec 26, 2027 | ♑ 5 | Horologium center — Constellation — V 5.2 — Southern Winter |
Weekly Solar-System Ephemeris
Snapshot: December 20, 2027 · 00:00 UTC
Notation:
Naked Eye
| ☉︎ Sun | ☽︎ Moon | ☿︎ Mercury | ♀︎ Venus | ♂︎ Mars | ♃︎ Jupiter | ♄︎ Saturn |
|---|---|---|---|---|---|---|
| ♐︎ 27°51′ β −0°00′ | ♍︎ 22°54′ β −4°00′ | ♑︎ 2°23′ β −1°48′ | ♒︎ 0°16′ β −1°51′ | ♑︎ 18°34′ β −1°05′ | ♍︎ 26°39′ β +1°13′ | ♈︎ 21°02′ β −2°36′ |
| Observing | ||||||
| ☉ | | ☉ | | | | |
Extended targets:
| ⚳︎ Ceres | ♅︎ Uranus | ♆︎ Neptune | ♇︎ Pluto |
|---|---|---|---|
| ♏︎ 2°32′ β +8°21′ | ♊︎ 7°08′ β −0°05′ | ♈︎ 3°52′ β −1°26′ | ♒︎ 5°38′ β −4°44′ |
| Observing | |||
| | | |
β = ecliptic latitude (+ north, − south). Observing combines visual magnitude with solar elongation. Two telescope glyphs = substantial telescope. ☉ = Near Sun — not currently observable.
Notation:
Planet Finder
Sky Notes
Naked eye
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Binoculars
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Telescope
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