Star Almanack
Alexander Ferrari Miller

ISO 2025-W37

Week begins: Monday, September 8, 2025

Notation:

Calendar

DateZodiac dayEvents
Mon, Sep 8, 2025♍ 18
M75 — Telescope 9 — Tropical Summer
Tabby's Star (KIC 8462852) — Telescope — Northern Summer
Tue, Sep 9, 2025♍ 19
C27 / NGC 6888 · Crescent Nebula / Finest NGC 98 / NGC 6888 · Crescent Nebula — Telescope 8 — Northern Summer
C37 / NGC 6885 — Telescope 6 — Northern Summer
Wed, Sep 10, 2025♍ 20
Thu, Sep 11, 2025♍ 21
α1 Cap — Binoculars 4 — Tropical Summer
Algedi (α2 Cap) — Binoculars 4 — Tropical Summer
Fri, Sep 12, 2025♍ 22
Dabih (β Cap) — Naked eye 3 — Tropical Summer
Sadr (γ Cyg) — Naked eye 2 — Northern Summer
Sat, Sep 13, 2025♍ 23
M29 — Telescope 7 — Northern Summer
Peacock (α Pav) — Naked eye 2 — Southern Summer
Sun, Sep 14, 2025♍ 24
🌗 Last Quarter — 10:32:58 UTC

Weekly Solar-System Ephemeris

Snapshot: Week begins September 8, 2025, 00:00 UTC.

(-90° to +90°; defaults +45°, 21:00 LAT)

Notation:
Body☉︎☽︎☿︎♀︎♂︎♃︎♄︎
Ecliptic♍︎ 15°37′
β −0°00′		♓︎ 18°51′
β +0°03′		♍︎ 10°31′
β +1°47′		♌︎ 16°00′
β +0°28′		♎︎ 20°29′
β +0°10′		♋︎ 19°05′
β −0°01′		♓︎ 29°31′
β −2°30′
ObservingNightNaked eye -12.7☉︎Naked eye -3.9Naked eye 1.6Naked eye -2.0Naked eye 0.6
Rise05:3218:2705:0202:5408:3700:3619:02
Set18:2805:5718:2517:2019:4115:5506:48

Extended targets:

Body⚳︎♅︎♆︎♇︎
Ecliptic♈︎ 14°36′
β −14°52′		♊︎ 1°28′
β −0°13′		♈︎ 1°11′
β −1°22′		♒︎ 1°40′
β −3°47′
ObservingTelescope 7.9Binoculars 5.7Telescope 7.7TelescopeTelescope 14.5
Rise20:3921:2019:0016:52
Set07:4012:2006:5901:33

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.

Notation:

Planet Finder

Planet Finder — Greek / Symbols
Greek / Symbols
Planet Finder — English
English
Planet Finder — Mixed Learner
Mixed Learner

Sky Notes

Kilroy: Sky Notes · generated 2026-10-23 15:54:29 UTC

View:

ISO 2025-W37 runs from September 8 through September 14. Saturn and Neptune are separated by about 1.7° in geocentric ecliptic longitude at the Monday 00:00 UTC snapshot. Mars is about 3.4° in ecliptic longitude from Spica in Virgo.

Naked eye: 🌗 Last Quarter — 10:32:58 UTC. Moderate moonlight makes timing and local sky position important for faint targets. Use Dabih, Sadr, Peacock as the week’s fixed-sky framework.

Dabih: The Southern Crowning Star of Capricorn — A detailed overview of Beta Capricorni, highlighting its characteristics and significance within the constellation.

The star in the middle of the Northern Cross — Sadr sits at the intersection of the Northern Cross, making it one of the most useful landmarks in the rich star fields of Cygnus.

The Peacock Star: A Bright Beacon in the Constellation Perseus — An in-depth look at the prominent star Alpha Pavonis, its astronomical significance, and its place in the southern sky.

Planets: Moon: Naked eye; magnitude -12.7; direct motion; 99.9% illuminated. Monday 00:00 UTC snapshot. Conjunction with Ceres in ecliptic longitude Sep 09 18:15 UTC. Conjunction with Saturn in ecliptic longitude Sep 08 17:44 UTC. Conjunction with Uranus in ecliptic longitude Sep 13 00:02 UTC. Conjunction with Neptune in ecliptic longitude Sep 08 20:32 UTC. Mercury: In solar glare; magnitude -1.6; direct motion; 98.1% illuminated. Monday 00:00 UTC snapshot. Solar conjunction in ecliptic longitude Sep 13 10:51 UTC. Venus: Naked eye; magnitude -3.9; direct motion; 86.1% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Mars: Naked eye; magnitude 1.6; direct motion; 96.5% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Ceres: Telescope; magnitude 7.9; retrograde motion; 99.2% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Sep 09 18:15 UTC. Jupiter: Naked eye; magnitude -2.0; direct motion; 99.3% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Saturn: Naked eye; magnitude 0.6; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Sep 08 17:44 UTC. Uranus: Binoculars; magnitude 5.7; retrograde motion; 99.9% illuminated. Below the horizon at 21:00 local apparent solar time, 45°N. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Sep 13 00:02 UTC. Neptune: Telescope; magnitude 7.7; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot. Conjunction with Moon in ecliptic longitude Sep 08 20:32 UTC. Pluto: Substantial telescope; magnitude 14.5; retrograde motion; 100.0% illuminated. Monday 00:00 UTC snapshot.

Binoculars: Trace Capricornus’s charted figure in the finder, then identify Alpha1 Cap at its charted position. Trace Capricornus’s closed figure in the finder, then identify Algedi at its charted position.

Alpha1 Cap: A Bright Beacon in the Sea of Capricorn — Discover the characteristics and significance of Alpha1 Cap in the constellation Capricornus.

Algedi: A Stellar Beacon in the Sea of Capella — Discover the enduring allure of Algedi, a distinguished star in the constellation Capricornus, guiding observers through the cosmic ocean.

Small telescope: M75: consult its dedicated finder and observing story for equipment guidance; Crescent Nebula: consult its dedicated finder and observing story for equipment guidance; NGC 6885: consult its dedicated finder and observing story for equipment guidance; M29: consult its dedicated finder and observing story for equipment guidance

M75: A Globular Cluster Hidden in Sagittarius — An exploration of Messier 75, a dense collection of ancient stars residing in the constellation Sagittarius.

The Crescent Nebula: A Stellar Emission Wonder in Cygnus — An overview of this luminous nebula, its characteristics, and significance in the cosmos.

The Open Cluster in Vulpecula: A Celestial Gathering — An enduring feature of the night sky, this open cluster offers a glimpse into stellar formation and evolution.

A small cluster in a crowded city — M29 is easy to underestimate because it sits in one of the richest stellar neighborhoods in the northern Milky Way.

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 05:02; sets 18:25 (45°N, local apparent solar time). Visual magnitude -1.6. The disk is 98.1% illuminated (gibbous). It is 5.4° from the Sun, on its west side. Motion is direct at 1.934° per day in ecliptic longitude at the snapshot. Position reference: Regulus, 10.4° away. Solar conjunction in ecliptic longitude Sep 13 10:51 UTC. Mercury: 10.4° from Regulus 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 26.5° below the horizon. Rises 02:54; sets 17:20 (45°N, local apparent solar time). Visual magnitude -3.9. The disk is 86.1% illuminated (gibbous). It is 29.6° from the Sun, on its west side. Motion is direct at 1.209° per day in ecliptic longitude at the snapshot. Position reference: Acubens, 5.9° away. Venus: 5.9° from Acubens 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 24.6° above the horizon. Rises 18:27; sets 05:57 (45°N, local apparent solar time). Visual magnitude -12.7. The disk is 99.9% illuminated (waning nearly full). It is 176.8° from the Sun, on its west side. Motion is direct at 14.284° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 9.0° away. Conjunction with Ceres in ecliptic longitude Sep 09 18:15 UTC. Conjunction with Saturn in ecliptic longitude Sep 08 17:44 UTC. Conjunction with Uranus in ecliptic longitude Sep 13 00:02 UTC. Conjunction with Neptune in ecliptic longitude Sep 08 20:32 UTC. Moon: 9.0° from Fumalsamakah 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 14.5° below the horizon. Rises 08:37; sets 19:41 (45°N, local apparent solar time). Visual magnitude 1.6. The disk is 96.5% illuminated (gibbous). It is 34.9° from the Sun, on its east side. Motion is direct at 0.656° per day in ecliptic longitude at the snapshot. Position reference: Spica, 4.3° away. Mars: 4.3° from Spica 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 22.1° below the horizon. Rises 00:36; sets 15:55 (45°N, local apparent solar time). Visual magnitude -2.0. The disk is 99.3% illuminated (nearly full). It is 56.5° from the Sun, on its west side. Motion is direct at 0.168° per day in ecliptic longitude at the snapshot. Position reference: Pollux, 8.1° away. Jupiter: 8.1° from Pollux 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 19.5° above the horizon. Rises 19:02; sets 06:48 (45°N, local apparent solar time). Visual magnitude 0.6. The disk is 100.0% illuminated (nearly full). It is 165.9° from the Sun, on its west side. Motion is retrograde at 0.074° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 15.6° away. Neptune is 2.0° away at the snapshot. Conjunction with Moon in ecliptic longitude Sep 08 17:44 UTC. Saturn: 15.6° from Fumalsamakah 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 3.6° below the horizon. Rises 21:20; sets 12:20 (45°N, local apparent solar time). Visual magnitude 5.7. The disk is 99.9% illuminated (nearly full). It is 104.1° from the Sun, on its west side. Motion is retrograde at 0.002° per day in ecliptic longitude at the snapshot. Position reference: Aldebaran, 10.1° away. Conjunction with Moon in ecliptic longitude Sep 13 00:02 UTC. Uranus: 10.1° 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 20.1° above the horizon. Rises 19:00; sets 06:59 (45°N, local apparent solar time). Visual magnitude 7.7. The disk is 100.0% illuminated (nearly full). It is 164.4° from the Sun, on its west side. Motion is retrograde at 0.026° per day in ecliptic longitude at the snapshot. Position reference: Fumalsamakah, 16.0° away. Saturn is 2.0° away at the snapshot. Conjunction with Moon in ecliptic longitude Sep 08 20:32 UTC. Neptune: 16.0° 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 3.0° above the horizon. Rises 20:39; sets 07:40 (45°N, local apparent solar time). Visual magnitude 7.9. The disk is 99.2% illuminated (nearly full). It is 147.7° from the Sun, on its west side. Motion is retrograde at 0.158° per day in ecliptic longitude at the snapshot. Position reference: Diphda, 12.6° away. Conjunction with Moon in ecliptic longitude Sep 09 18:15 UTC. Ceres: 12.6° from Diphda 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 21.4° above the horizon. Rises 16:52; sets 01:33 (45°N, local apparent solar time). Visual magnitude 14.5. The disk is 100.0% illuminated (nearly full). It is 135.9° from the Sun, on its east side. Motion is retrograde at 0.015° per day in ecliptic longitude at the snapshot. Position reference: Dabih, 8.8° away. Pluto: 8.8° from Dabih in the Pathfinder.