The lunar calendar shows New Moon, First Quarter, Full Moon and Last Quarter moments from NASA/GSFC’s published table. This release covers phases in 2025–2030, a local-month event table, print and ICS export. It does not choose favorable dates for personal affairs.
Select an instant and a zone
Enter a valid Gregorian date as YYYY-MM-DD and a 24-hour UTC time. Changing the IANA display zone never changes that input instant: UTC and local time with a numeric offset are shown together. Daylight-saving transitions come from the browser’s database. The event month is selected separately and refers to local dates in that zone.
Why civil dates differ
The table’s New Moon on October 10, 2026 at 15:50 UT appears as 18:50 in Europe/Moscow and 05:50 on October 11 in Pacific/Kiritimati. It is one event, not different phases. For minute-resolution civil display, UT is represented as UTC without a UT1–UTC correction; no sub-minute accuracy is claimed.
Resolution is not accuracy
Fred Espenak prepared the NASA table using Jean Meeus’ algorithms (1998). Its times are rounded to minutes. Twelve selected 2026 checks against USNO differed by 0 or 1 minute; this is not proof of that error bound for the entire range. For example, NASA lists First Quarter on October 18, 2026 at 16:13 UT; USNO lists 16:12 UT. We reproduce NASA’s value and identify the difference.
Illumination and elapsed age
Illumination uses the nearest available hourly NASA SVS 2026 sample, not the former mean-cycle sine curve. The sample time is displayed; no percentage is substituted for other years. One decimal place is a display format, not a measured accuracy. Age means elapsed time since tabulated New Moon, not a universal lunar-day number. Rise/set, visibility, Moon signs and eclipses are not calculated.
Print and ICS import
Select the local event month and download .ics. The file contains the same phases with stable identifiers and UTC times; your calendar application chooses the display zone. Mandatory seconds 00 fill the format, not a second-accuracy promise. Each event is a transparent one-minute marker without an alarm, not a physical phase lasting one minute. Before saving, check the October 10 example and your display zone; this guide does not claim a tested import into your particular application. Print opens the browser’s standard dialog.
Limits
The calendar offers no medical, financial, legal or haircut advice. Astronomical data do not establish those links. For a quick current snapshot, open the Moon now; the lunar-day explanation covers removal of the former counter.
Sources: Fred Espenak’s phase table, NASA/GSFC (Jean Meeus algorithms, 1998), NASA SVS 2026 (hourly illumination, DE421), and the USNO 2026 check table. Checked October 18, 2026.
