Almanac · Eclipses

Penumbral lunar eclipse, 17 Aug 2027

The Moon passes only through the Earth’s faint outer shadow: it dims, and a dimming this slight is easy to miss. Greatest eclipse is on Tue 17 Aug 2027 at 07:14 UTC.

• Greatest eclipse Tue 17 Aug 2027, 07:14 UTC The Moon overhead at 12.4°S 108°W
• Magnitude -0.526 Umbral; penumbral 0.546
• Longest Penumbral 3h39m The same from everywhere the Moon is up

City by city

An eclipse of the Moon is the same sight from everywhere the Moon is up. The biggest cities on our list that see all of it, spread round that side of the world, the Moon highest first, then some that see part. Every time is the city’s own clock.

• Hanga Roa (Easter Island), Chile All of it, the Moon 75° up at greatest eclipse Begins 23:24 · Deepest 01:14 · Ends 03:03 GMT-6 Watch from here
• Lima, Peru All of it, the Moon 59° up at greatest eclipse Begins 00:24 · Deepest 02:14 · Ends 04:03 GMT-5 Watch from here
• Mexico City, Mexico All of it, the Moon 56° up at greatest eclipse Begins 23:24 · Deepest 01:14 · Ends 03:03 CST Watch from here
• Bogotá, Colombia All of it, the Moon 52° up at greatest eclipse Begins 00:24 · Deepest 02:14 · Ends 04:03 GMT-5 Watch from here
• Los Angeles, USA All of it, the Moon 42° up at greatest eclipse Begins 22:24 · Deepest 00:14 · Ends 02:03 PDT Watch from here
• Santo Domingo, Dominican Republic All of it, the Moon 41° up at greatest eclipse Begins 01:24 · Deepest 03:14 · Ends 05:03 AST Watch from here
• Buenos Aires, Argentina All of it, the Moon 39° up at greatest eclipse Begins 02:24 · Deepest 04:14 · Ends 06:03 GMT-3 Watch from here
• São Paulo, Brazil All of it, the Moon 30° up at greatest eclipse Begins 02:24 · Deepest 04:14 · Ends 06:03 GMT-3 Watch from here
• New York, USA All of it, the Moon 27° up at greatest eclipse Begins 01:24 · Deepest 03:14 · Ends 05:03 EDT Watch from here
• Lagos, Nigeria Part of it: the Moon sets during it Begins 06:24 · Deepest 08:14 · Ends after moonset GMT+1 Watch from here
• Sydney, Australia Part of it: the Moon rises during it Begins before moonrise · Deepest 17:14 · Ends 19:03 GMT+10 Watch from here
• Casablanca, Morocco Part of it: the Moon sets during it Begins 05:24 · Deepest 07:14 · Ends after moonset GMT+0 Watch from here
• Dakar, Senegal Part of it: the Moon sets during it Begins 05:24 · Deepest 07:14 · Ends after moonset GMT Watch from here

The eclipse, contact by contact

In the outer shadow for 3h39m.

Latitude by latitude

Along each latitude, the longitudes with the Moon above the horizon for the whole eclipse, and those with it up at the greatest moment. An eclipse of the Moon looks the same from everywhere it is up.

How we worked it out: the Moon’s and the Sun’s places are Meeus’s solar and lunar theories, the ones the map draws. The Earth’s shadow is sized by Danjon’s rule, as NASA’s catalogue has it, and each contact is the instant the Moon’s edge crosses the shadow’s, found to the second. Each latitude is walked 1° of longitude at a time, the Moon’s altitude asked every 15 minutes. The tests hold these to NASA’s Five Millennium Canon of eclipses: instants within a few minutes, magnitudes within a few thousandths, the phases within two minutes.

• F. Espenak and J. Meeus, NASA Five Millennium Canon of Solar and Lunar Eclipses, which the tests hold these to
• J. Meeus, Astronomical Algorithms, ch. 25 (the Sun) and ch. 47 (the Moon), as the map draws them
• Danjon’s rule for the Earth’s shadow, as NASA’s lunar eclipse catalogue applies it (NASA/TP-2009-214172, §1.3)

All eclipses · 14 Mar 2025 · 7 Sep 2025 · 3 Mar 2026 · 28 Aug 2026 · 20 Feb 2027 · 18 Jul 2027 · How eclipses work · Tonight · JSON