What does “ephemeris” mean?

From the Greek ephēmeros, “lasting a day”: a day-by-day table of where the celestial bodies stand. Plural: ephemerides. Every printed almanac is built around one; this page computes its lunar rows live instead of printing them.

Are these times exact?

The phase instants come from the standard algorithms (Jean Meeus, Astronomical Algorithms), accurate to the minute for decades around the present, and are shown in your time zone. Eclipse dates are given as the day of maximum in Universal Time: your local night can be the evening before.

Where do the app events come from?

They are the events shown on Plenilune's App Store page, mirrored word for word from the same source file. Nothing is written twice. When no event is running, the agenda simply shows the sky.

← All guides

Guides

Moon ephemeris: what the sky is about to do

The oldest page of any almanac is the one that looks forward. This one is computed the moment you open it, in your own time zone: the phases to come, the eclipses on their way, and the app's own rendezvous.

Facts checked August 2026

This agenda comes from Plenilune, my lunar almanac app for iOS: phases and eclipses are computed with Jean Meeus's algorithms and shown in your time zone.

Saturday, October 10, 2026 · 3:49 PMNew Moon
Monday, October 26, 2026 · 4:11 AMFull MoonHunter’s Moon
Monday, November 9, 2026 · 7:01 AMNew Moon
Tuesday, November 24, 2026 · 2:53 PMFull MoonBeaver Moon
Wednesday, December 9, 2026 · 12:51 AMNew Moon
Thursday, December 24, 2026 · 1:28 AMFull MoonCold Moon
Thursday, January 7, 2027 · 8:24 PMNew Moon
Friday, January 22, 2027 · 12:17 PMFull MoonWolf Moon
February 20, 2027Penumbral lunar eclipseAbout lunar eclipses
July 18, 2027Penumbral lunar eclipseAbout lunar eclipses
August 17, 2027Penumbral lunar eclipseAbout lunar eclipses
January 12, 2028Partial lunar eclipseAbout lunar eclipses

Times are in Universal Time (UTC) until your time zone is detected. Computed in your browser with the same astronomical algorithms as the Plenilune app (Jean Meeus, Astronomical Algorithms). Nothing is fetched from a server.

What an ephemeris is

An ephemeris (from the Greek ephēmeros, “daily”) is the table every printed almanac is built on: for each date, what the sky will do. Observatories publish theirs to extraordinary precision. A lunar almanac needs less and keeps the essentials: the instants of the principal phases, and the rare nights when the Earth's shadow crosses the Moon. That table is what you are reading above, computed rather than printed.

What this page carries

Three kinds of entries share the agenda. The full and new moons of the next four lunar months, computed in your browser with the reference algorithms. Each full moon links to the story of its traditional name. The coming lunar eclipses, through 2029. And, when one is running, the current event in the Plenilune app: the same card the App Store shows, mirrored here word for word.

Questions

What does “ephemeris” mean?: From the Greek ephēmeros, “lasting a day”: a day-by-day table of where the celestial bodies stand. Plural: ephemerides. Every printed almanac is built around one; this page computes its lunar rows live instead of printing them.
Are these times exact?: The phase instants come from the standard algorithms (Jean Meeus, Astronomical Algorithms), accurate to the minute for decades around the present, and are shown in your time zone. Eclipse dates are given as the day of maximum in Universal Time: your local night can be the evening before.
Where do the app events come from?: They are the events shown on Plenilune's App Store page, mirrored word for word from the same source file. Nothing is written twice. When no event is running, the agenda simply shows the sky.