ISO week 50 2027

This week is currently in preparation and will be published as part of the Star Almanack.

Week begins: Monday, December 13, 2027

Notation:

Calendar

Date	Zodiac day	Events
Mon, Dec 13, 2027	22	🌕 Full Moon · Moon Before Yule — 16:08:48 UTC C14, NGC 869/884, Double Cluster, open cluster in Perseus — V 4.3 — Finest NGC — Northern Autumn
Tue, Dec 14, 2027	23	Geminids peak · radiant in Gemini · expected ZHR ≈ 150 · Moon 99% illuminated: strong moonlight interference · Use a dark site, allow 20–30 minutes for dark adaptation, and observe with the unaided eye. Put the Moon behind a building, tree, or other obstruction and watch the darkest open sky. Hydrus center — Constellation — V 2.9 — Antarctic Autumn C23, NGC 891, Silver Needle, spiral galaxy in Andromeda — V 9.9 — Finest NGC — Northern Autumn
Wed, Dec 15, 2027	24	NGC 936, galaxy in Cetus — V 11.2 — Finest NGC — Tropical Autumn
Thu, Dec 16, 2027	25	Polaris (α UMi) — V 2 — Arctic Autumn
Fri, Dec 17, 2027	26	Aries center — Constellation — V 3.1 — Tropical Autumn
Sat, Dec 18, 2027	27	M34, open cluster in Perseus — V 5.5 — Northern Autumn M77, spiral galaxy in Cetus — V 8.9 — Tropical Autumn NGC 1023, galaxy in Perseus — V 9.6 — Finest NGC — Northern Autumn
Sun, Dec 19, 2027	28	☉ Galactic Center conjunction — 09:42:00 UTC Fornax center — Constellation — V 4.5 — Southern Autumn Head of Cetus center — Asterism — V 2.5 — Tropical Autumn C67, NGC 1097, barred spiral galaxy in Fornax — V 9.2 — Southern Autumn

Weekly Solar-System Ephemeris

Snapshot: December 13, 2027 · 00:00 UTC

Notation:

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♐︎ 20°44′ β +0°00′	♊︎ 11°47′ β +4°02′	♐︎ 21°20′ β −1°16′	♑︎ 21°39′ β −1°46′	♑︎ 13°09′ β −1°04′	♍︎ 26°05′ β +1°11′	♈︎ 21°08′ β −2°38′
Observing
☉		☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♎︎ 29°47′ β +8°15′	♊︎ 7°24′ β −0°05′	♈︎ 3°51′ β −1°26′	♒︎ 5°27′ 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

Planet Finder — Mixed Learner — Mixed Learner

Sky Notes

Naked eye

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Binoculars

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Telescope

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