ISO 2027-W50
Week begins: Monday, December 13, 2027
Calendar
| Date | Zodiac day | Events |
|---|---|---|
| Mon, Dec 13, 2027 | ♐ 22 | 🌕 Full Moon · Moon Before Yule — 16:08:48 UTC Mira (ο Ceti) (variable brightness) — Tropical Autumn C14 / NGC 869/884 · Double Cluster —  4 4.3 — Northern Autumn |
| Tue, Dec 14, 2027 | ♐ 23 | Finest NGC 17 / NGC 884 · Double Cluster with 869 — 4 4.4 — Northern AutumnFinest NGC 12 / NGC 891 · Silver Needle / C23 / NGC 891 — 11 10.9 — Northern Autumn |
| Wed, Dec 15, 2027 | ♐ 24 | Finest NGC 16 / NGC 936 · MCG 0-7-17 — 11 11.2 — Tropical Autumn |
| Thu, Dec 16, 2027 | ♐ 25 | Polaris (α UMi) / Polaris (α Ursae Minoris) —  Var 2 2.0 1.9–2.1 — Arctic Autumn |
| Fri, Dec 17, 2027 | ♐ 26 | |
| Sat, Dec 18, 2027 | ♐ 27 | Finest NGC 18 / NGC 1023 · Arp 135 — 10 9.6 — Northern AutumnM34 — 6 5.5 — Northern AutumnM77 — 9 8.9 — Tropical Autumn |
| Sun, Dec 19, 2027 | ♐ 28 | C67 / NGC 1097 — 9 9.2 — Southern Autumn |
Weekly Solar-System Ephemeris
Snapshot: Week begins December 13, 2027, 00:00 UTC.
(-90° to +90°; defaults +45°, 21:00 LAT)
| Body | ☉︎ | ☽︎ | ☿︎ | ♀︎ | ♂︎ | ♃︎ | ♄︎ |
|---|---|---|---|---|---|---|---|
| Ecliptic | ♐︎ 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 |  | -12.6 | ☉︎ | -3.9 | 1.2 | -2.0 | 0.4 |
| Rise | 07:35 | 15:17 | 07:46 | 09:54 | 09:19 | 00:14 | 13:37 |
| Set | 16:25 | 07:21 | 16:18 | 18:36 | 17:57 | 12:43 | 02:29 |
Extended targets:
| Body | ⚳︎ | ♅︎ | ♆︎ | ♇︎ |
|---|---|---|---|---|
| Ecliptic | ♎︎ 29°47′ β +8°15′ | ♊︎ 7°24′ β −0°05′ | ♈︎ 3°51′ β −1°26′ | ♒︎ 5°27′ β −4°44′ |
| Observing | 8.8 |  5.6 | 7.7 | 14.6 |
| Rise | 02:54 | 15:27 | 12:54 | 10:56 |
| Set | 14:32 | 06:39 | 01:00 | 19:37 |
β = ecliptic latitude (+ north, − south).
Rise and set are Local Apparent Time for the selected latitude.
Naked-eye observing uses the Sun’s altitude at the selected Monday observer time: Daylight (Sun ≥ −0.833°), Civil twilight (−0.833° to −6°), Nautical twilight (−6° to −12°), Astronomical twilight (−12° to −18°), and Night (below −18°).
Solar Glare identifies a body too close to the Sun when the sky-state rule does not already supersede its naked-eye classification.
The Sun’s observing status uses this same five-state sky classification.
Planet Finder
Sky Notes
Kilroy: Sky Notes · generated 2026-10-23 00:47:47 UTC
ISO 2027-W50 runs from December 13 through December 19. To find Mars, first identify Sagittarius, trace the Teapot of Sagittarius, and locate Nunki in that pattern. Mars lies about 0.8° away in ecliptic longitude at the Monday 00:00 UTC snapshot; use the finder to transfer from Nunki to the planet. Uranus is about 2.4° in ecliptic longitude from Aldebaran in Taurus.
Naked eye: 🌕 Full Moon · Moon Before Yule — 16:08:48 UTC. Bright moonlight favors prominent stars and planets while reducing contrast on faint deep-sky objects. Use Polaris as the week’s fixed-sky framework.
Planets: Moon: Naked eye; magnitude -12.6; direct motion; 99.3% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude Dec 13 16:08 UTC. Mercury: In solar glare; magnitude -1.3; direct motion; 99.9% illuminated. Monday 00:00 UTC snapshot. Venus: Naked eye; magnitude -3.9; direct motion; 85.9% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Mars: Naked eye; magnitude 1.2; direct motion; 98.2% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Ceres: Telescope; magnitude 8.8; direct motion; 97.7% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Jupiter: Naked eye; magnitude -2.0; direct motion; 99.2% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Saturn: Naked eye; magnitude 0.4; retrograde motion; 99.8% illuminated. Monday 00:00 UTC snapshot. Uranus: Binoculars; magnitude 5.6; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Neptune: Telescope; magnitude 7.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Station Dec 15 09:07 UTC: turns direct. Pluto: Substantial telescope; magnitude 14.6; direct motion; 100.0% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot.
Binoculars: No fixed-sky Calendar object is classified for binocular observing this week.
Small telescope: Double Cluster with 869: consult its dedicated finder and observing story for equipment guidance; Silver Needle: consult its dedicated finder and observing story for equipment guidance; MCG 0-7-17: consult its dedicated finder and observing story for equipment guidance; Arp 135: consult its dedicated finder and observing story for equipment guidance; M34: consult its dedicated finder and observing story for equipment guidance; M77: consult its dedicated finder and observing story for equipment guidance; NGC 1097: consult its dedicated finder and observing story for equipment guidance
Substantial telescope: No fixed-sky Calendar object is classified as requiring a substantial telescope this week.
Other objects listed this week: None
Mercury
Mercury: in solar glare at the Monday 00:00 UTC snapshot. Rises 07:46; sets 16:18 (45°N, local apparent solar time). Visual magnitude -1.3. The disk is 99.9% illuminated (nearly full). It is 1.4° from the Sun, on its east side. Motion is direct at 1.573° per day in ecliptic longitude at the snapshot. Position reference: Sabik, 9.0° away. Mercury: 9.0° from Sabik in the Pathfinder.
Venus
Venus: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 24.1° below the horizon. Rises 09:54; sets 18:36 (45°N, local apparent solar time). Visual magnitude -3.9. The disk is 85.9% illuminated (gibbous). It is 31.0° from the Sun, on its east side. Motion is direct at 1.234° per day in ecliptic longitude at the snapshot. Position reference: Nunki, 9.0° away. Venus: 9.0° from Nunki in the Pathfinder.
Moon
Moon: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 56.4° above the horizon. Rises 15:17; sets 07:21 (45°N, local apparent solar time). Visual magnitude -12.6. The disk is 99.3% illuminated (waxing nearly full). It is 170.2° from the Sun, on its east side. Motion is direct at 14.215° per day in ecliptic longitude at the snapshot. Position reference: Aldebaran, 9.6° away. Opposition in ecliptic longitude Dec 13 16:08 UTC. Moon: 9.6° from Aldebaran in the Pathfinder.
Mars
Mars: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 30.9° below the horizon. Rises 09:19; sets 17:57 (45°N, local apparent solar time). Visual magnitude 1.2. The disk is 98.2% illuminated (gibbous). It is 22.4° from the Sun, on its east side. Motion is direct at 0.770° per day in ecliptic longitude at the snapshot. Position reference: Nunki, 2.4° away. Mars: 2.4° from Nunki in the Pathfinder.
Jupiter
Jupiter: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 31.5° below the horizon. Rises 00:14; sets 12:43 (45°N, local apparent solar time). Visual magnitude -2.0. The disk is 99.2% illuminated (nearly full). It is 84.6° from the Sun, on its west side. Motion is direct at 0.091° per day in ecliptic longitude at the snapshot. Position reference: Zavijava, 1.6° away. Jupiter: 1.6° from Zavijava in the Pathfinder.
Saturn
Saturn: naked eye at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 48.7° above the horizon. Rises 13:37; sets 02:29 (45°N, local apparent solar time). Visual magnitude 0.4. The disk is 99.8% illuminated (nearly full). It is 120.4° from the Sun, on its east side. Motion is retrograde at 0.020° per day in ecliptic longitude at the snapshot. Position reference: Alrescha, 10.7° away. Saturn: 10.7° from Alrescha in the Pathfinder.
Uranus
Uranus: binoculars at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 55.5° above the horizon. Rises 15:27; sets 06:39 (45°N, local apparent solar time). Visual magnitude 5.6. The disk is 100.0% illuminated (nearly full). It is 166.7° from the Sun, on its east side. Motion is retrograde at 0.041° per day in ecliptic longitude at the snapshot. Position reference: Aldebaran, 6.1° away. Uranus: 6.1° from Aldebaran in the Pathfinder.
Neptune
Neptune: telescope at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 37.5° above the horizon. Rises 12:54; sets 01:00 (45°N, local apparent solar time). Visual magnitude 7.7. The disk is 100.0% illuminated (nearly full). It is 103.1° from the Sun, on its east side. Motion is retrograde at 0.001° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 18.2° away. Station Dec 15 09:07 UTC: turns direct. Neptune: 18.2° from Fumalsamakah in the Pathfinder.
Ceres
Ceres: telescope at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 48.4° below the horizon. Rises 02:54; sets 14:32 (45°N, local apparent solar time). Visual magnitude 8.8. The disk is 97.7% illuminated (gibbous). It is 51.4° from the Sun, on its west side. Motion is direct at 0.398° per day in ecliptic longitude at the snapshot. Position reference: Spica, 11.7° away. Ceres: 11.7° from Spica in the Pathfinder.
Pluto
Pluto: substantial telescope at the Monday 00:00 UTC snapshot. At 45°N and 21:00 local apparent solar time, it is 13.6° below the horizon. Rises 10:56; sets 19:37 (45°N, local apparent solar time). Visual magnitude 14.6. The disk is 100.0% illuminated (nearly full). It is 44.9° from the Sun, on its east side. Motion is direct at 0.024° per day in ecliptic longitude at the snapshot. Position reference: Dabih, 9.4° away. Pluto: 9.4° from Dabih in the Pathfinder.
Highlights
Mercury
In solar glare; magnitude -1.3; direct motion; 99.9% illuminated. Monday 00:00 UTC snapshot. Mercury: 9.0° from Sabik in the Pathfinder.
Venus
Naked eye; magnitude -3.9; direct motion; 85.9% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Venus: 9.0° from Nunki in the Pathfinder.
Moon
Naked eye; magnitude -12.6; direct motion; 99.3% illuminated. Monday 00:00 UTC snapshot. Opposition in ecliptic longitude Dec 13 16:08 UTC. Moon: 9.6° from Aldebaran in the Pathfinder.
Mars
Naked eye; magnitude 1.2; direct motion; 98.2% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Mars: 2.4° from Nunki in the Pathfinder.
Jupiter
Naked eye; magnitude -2.0; direct motion; 99.2% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Jupiter: 1.6° from Zavijava in the Pathfinder.
Saturn
Naked eye; magnitude 0.4; retrograde motion; 99.8% illuminated. Monday 00:00 UTC snapshot. Saturn: 10.7° from Alrescha in the Pathfinder.
Uranus
Binoculars; magnitude 5.6; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Uranus: 6.1° from Aldebaran in the Pathfinder.
Neptune
Telescope; magnitude 7.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Station Dec 15 09:07 UTC: turns direct. Neptune: 18.2° from Fumalsamakah in the Pathfinder.
Ceres
Telescope; magnitude 8.8; direct motion; 97.7% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Ceres: 11.7° from Spica in the Pathfinder.
Pluto
Substantial telescope; magnitude 14.6; direct motion; 100.0% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Pluto: 9.4° from Dabih in the Pathfinder.