ISO week 52 2025
This week is currently in preparation and will be published as part of the Star Almanack.
Week begins: Monday, December 22, 2025
Notation:
Calendar
| Date | Zodiac day | Events |
|---|---|---|
| Mon, Dec 22, 2025 | ♑ 2 |  Ursids peak · radiant in Ursa Minor · expected ZHR ≈ 10 · Moon 5% illuminated: little 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.Menkar (α Cet) —  V 3 — Tropical Winter |
| Tue, Dec 23, 2025 | ♑ 3 | Algol (β Per) — V 2 — Northern Winter |
| Wed, Dec 24, 2025 | ♑ 4 | Dalim (α For) —  V 4 — Southern WinterC87, NGC 1261, globular cluster in Horologium —  V 8.4 — Southern 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 |
| Thu, Dec 25, 2025 | ♑ 5 | |
| Fri, Dec 26, 2025 | ♑ 6 | Horologium center — Constellation — V 5.2 — Southern WinterC24, NGC 1275, Perseus A, Seyfert galaxy in Perseus — V 11.6 — Northern Winter |
| Sat, Dec 27, 2025 | ♑ 7 | 🌓 First Quarter — 19:09:51 UTC Mirfak (α Per) — V 2 — Northern Winter — in the Milky Way |
| Sun, Dec 28, 2025 | ♑ 8 |
Weekly Solar-System Ephemeris
Snapshot: December 22, 2025 · 00:00 UTC
Notation:
Naked Eye
| ☉︎ Sun | ☽︎ Moon | ☿︎ Mercury | ♀︎ Venus | ♂︎ Mars | ♃︎ Jupiter | ♄︎ Saturn |
|---|---|---|---|---|---|---|
| ♑︎ 0°23′ β −0°00′ | ♑︎ 21°51′ β −3°50′ | ♐︎ 13°44′ β +0°38′ | ♐︎ 26°37′ β −0°07′ | ♑︎ 5°04′ β −0°49′ | ♋︎ 22°36′ β +0°13′ | ♓︎ 25°40′ β −2°18′ |
| Observing | ||||||
| ☉ | | ☉ | ☉ | ☉ | | |
Extended targets:
| ⚳︎ Ceres | ♅︎ Uranus | ♆︎ Neptune | ♇︎ Pluto |
|---|---|---|---|
| ♈︎ 5°10′ β −9°35′ | ♉︎ 28°15′ β −0°12′ | ♓︎ 29°25′ β −1°20′ | ♒︎ 2°26′ β −3°46′ |
| 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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