Question 1

What phase is the Moon in New York on January 31, 2029?

Accepted Answer

The Moon is Last Quarter, 91% illuminated, on lunar day 18. It rises at 20:33 and sets at 08:37.

Question 2

What does 91% illumination mean?

Accepted Answer

The share of the Moon's visible disc that is lit by the Sun. 0% is new moon and 100% is full moon. Illumination changes fastest near the quarters and slowest near new and full moon.

Question 3

When can the Moon be seen on January 31, 2029?

Accepted Answer

The Moon is above the horizon for about 12h 4m, from 20:33 to 08:37, reaching at 46° at culmination.

Question 4

How accurate is this moon data?

Accepted Answer

Phase, illumination and moon events are computed from astronomical ephemerides for the city's coordinates and timezone. Moonrise and moonset also depend on the local horizon and elevation.

Moon phase for January 31, 2029

Last Quarter

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