Moon phase on December 30, 1984

First Quarter, 58%
🌓 First Quarter
Sunday, December 30, 1984 · at noon (Brasília)
Illumination: 58% Age: 8.1 days Cycle: 27%

On Sunday, December 30, 1984 the Moon was in its first quarter phase, with 58% of its disk illuminated and an age of 8.1 days since the last new moon. Half of the disk is lit, about a week after the new moon. The Moon is easy to see in the early evening and sets around midnight.

Moon data for this date

Moon at noon Brasília time (UTC-3)
Phase🌓 First Quarter
Illumination58%
Moon age8.1 days
Day of the weekSunday
Last new moonDecember 22, 1984 at 08:47
Next full moonJanuary 6, 1985 at 23:16 (in 7.5 days)
Next new moonJanuary 20, 1985 at 23:28 (in 21.5 days)

The Moon on the surrounding days

Compare the phase and illumination over the three days before and after. Click a day to open its page.

← December 29, 1984 December 31, 1984 →

About the first quarter

Half of the disk is lit, about a week after the new moon. The Moon is easy to see in the early evening and sets around midnight. The phase name comes from the Moon's position in its 29.53-day cycle: on December 30, 1984 it had completed 27% of the cycle that began with the new moon on December 22, 1984.

Looking for another date, such as a birthday? Use the Moon phase on the day I was born tool, see the Moon phase today page with the lunar calendar, or find the day of the week of December 30, 1984. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on December 30, 1984?

On December 30, 1984 the Moon was in its first quarter phase, with 58% of the disk lit (calculated at noon Brasília time).

How old is the Moon on that date?

The age is the time since the last new moon: 8.1 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after December 30, 1984 falls on January 6, 1985 at 23:16 Brasília time.

When is the next new moon after that date?

The next new moon after December 30, 1984 falls on January 20, 1985 at 23:28 Brasília time.

How is the Moon phase calculated?

With Jean Meeus's astronomical formulas for the instants of new, quarter and full moon. The age comes from the time since the last new moon and the illumination is (1 − cos(2π × cycle fraction)) / 2.

Is the phase the same everywhere in the world?

Yes, the phase and the illuminated percentage are the same across the planet at any given instant. Only the orientation changes: in the southern hemisphere a waxing Moon is lit on the left, in the northern one on the right.