ISO 2026-W25

ISO dates: 2026-W25-1 through 2026-W25-7

Civil dates: Jun 15, 2026 – Jun 21, 2026

Calendar

Date	Zodiac day	Events
Mon, Jun 15, 2026	♊ 26	Boötes center — Constellation — V 3.5 — Northern Spring Ursa Minor center — Constellation — V 4.2 — Arctic Spring 🌑 New Moon — 02:54:10 UTC η Cen — 2 — Southern Spring
Tue, Jun 16, 2026	♊ 27	C66, NGC 5694, globular cluster in Hydra — V 10.2 — Southern Spring C66 / NGC 5694 — 10 — Southern Spring Rigil Kentaurus (α Cen) — 0 — Southern Spring
Wed, Jun 17, 2026	♊ 28	α Lup — 2 — Southern Spring α Cir — 3 — Southern Spring
Thu, Jun 18, 2026	♊ 29	NGC 5746, galaxy in Virgo — V 11.4 — Finest NGC — Tropical Spring Finest NGC 85 / NGC 5746 · MCG 0-38-5 — 11 — Tropical Spring Izar (ε Boo) — 2 — Northern Spring α Aps — 4 — Antarctic Spring
Fri, Jun 19, 2026	♊ 30	Circinus center — Constellation — V 4.1 — Southern Spring α1 Lib — 5 — Tropical Spring Kochab (β UMi) — 2 — Arctic Spring Zubenelgenubi (α2 Lib) — 3 — Tropical Spring
Sat, Jun 20, 2026	♊ 31
Sun, Jun 21, 2026	♋ 1	♋ Sun enters Cancer · Summer solstice · Litha — 08:24:30 UTC 🌓 First Quarter — 21:55:25 UTC β Lup — 3 — Southern Summer

Weekly Solar-System Ephemeris

Snapshot: June 15, 2026 · 00:00 UTC

Naked Eye

☉︎ Sun	☽︎ Moon	☿︎ Mercury	♀︎ Venus	♂︎ Mars	♃︎ Jupiter	♄︎ Saturn
♊︎ 23°56′ β +0°00′	♊︎ 22°12′ β +4°44′	♋︎ 18°24′ β +1°09′	♌︎ 1°48′ β +2°02′	♉︎ 20°03′ β −0°29′	♋︎ 26°49′ β +0°25′	♈︎ 13°18′ β −2°19′
Observing
☉	☉

Extended targets:

⚳︎ Ceres	♅︎ Uranus	♆︎ Neptune	♇︎ Pluto
♊︎ 6°58′ β −2°42′	♊︎ 2°52′ β −0°09′	♈︎ 4°17′ β −1°21′	♒︎ 5°10′ β −4°11′
Observing
☉

β = ecliptic latitude (+ north, − south). Observing combines visual magnitude with solar elongation. Two telescope glyphs = substantial telescope. ☉ = Near Sun — not currently observable.

Planet Finder

Sky Note

New Moon opens the week, Alpha Centauri reaches its Almanack date on June 16, and the June solstice follows on June 21. This is a strong orientation week linking the seasonal turning point with conspicuous northern and southern sky markers.

Naked eye: From sufficiently southerly latitudes, Alpha Centauri is one of the brightest stars in the sky and an unmistakable southern landmark. Northern observers should instead use Arcturus, the Big Dipper, and the rising summer constellations to follow the seasonal transition.

Binoculars: Sweep the rich southern Milky Way around Centaurus if it is accessible from your latitude. In northern skies, binoculars are excellent for following the growing summer Milky Way as darkness arrives later in the evening.

Small telescope: Izar in Boötes is a worthwhile double-star target when seeing is steady. Center it at low power and increase magnification gradually rather than assuming maximum power will give the best view.

What to expect: The solstice is a geometric turning point in the Sun's annual path, not a sudden change in the stars. The practical observing effect is seasonal: long northern evenings compress the darkest observing window while southern winter nights lengthen.

Chart

ISO2026-W25-chart.png — chart slot.