ISO week 25 2025

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

Week begins: Monday, June 16, 2025

Notation:

Calendar

Date	Zodiac day	Events
Mon, Jun 16, 2025	28	Rigil Kentaurus (α Cen) — V 0 — Southern Spring C66, NGC 5694, globular cluster in Hydra — V 10.2 — Southern Spring
Tue, Jun 17, 2025	29	α Cir — V 3 — Southern Spring α Lup — V 2 — Southern Spring Izar (ε Boo) — V 2 — Northern Spring NGC 5746, galaxy in Virgo — V 11.4 — Finest NGC — Tropical Spring
Wed, Jun 18, 2025	30	🌗 Last Quarter — 19:19:06 UTC α Aps — V 4 — Antarctic Spring Circinus center — Constellation — V 4.1 — Southern Spring
Thu, Jun 19, 2025	31	α1 Lib — V 5 — Tropical Spring Zubenelgenubi (α2 Lib) — V 3 — Tropical Spring Kochab (β UMi) — V 2 — Arctic Spring
Fri, Jun 20, 2025	32
Sat, Jun 21, 2025	1	Sun enters Cancer · Summer solstice · Litha — 02:42:16 UTC β Lup — V 3 — Southern Summer
Sun, Jun 22, 2025	2	Nekkar (β Boo) — V 3 — Northern Summer C88, NGC 5823, open cluster in Circinus — V 7.9 — Southern Summer

Weekly Solar-System Ephemeris

Snapshot: June 16, 2025 · 00:00 UTC

Notation:

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♊︎ 25°07′ β −0°00′	♒︎ 20°00′ β −2°41′	♋︎ 13°22′ β +2°01′	♉︎ 9°58′ β −2°39′	♌︎ 29°14′ β +1°14′	♋︎ 1°24′ β −0°09′	♈︎ 1°19′ β −2°10′
Observing
☉		☉			☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♈︎ 8°45′ β −10°21′	♉︎ 28°57′ β −0°13′	♈︎ 2°05′ β −1°19′	♒︎ 3°26′ β −3°41′
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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