Moon phase on October 17, 1998

Waning Crescent, 9%
🌘 Waning Crescent
Saturday, October 17, 1998 · at noon (Brasília)
Illumination: 9% Age: 26.9 days Cycle: 90%

On Saturday, October 17, 1998 the Moon was in its waning crescent phase, with 9% of its disk illuminated and an age of 26.9 days since the last new moon. Only a thin sliver is left, visible in the east shortly before dawn, as the cycle prepares to start over with the new moon.

Moon data for this date

Moon at noon Brasília time (UTC-3)
Phase🌘 Waning Crescent
Illumination9%
Moon age26.9 days
Day of the weekSaturday
Last new moonSeptember 20, 1998 at 14:01
Next full moonNovember 4, 1998 at 03:18 (in 17.6 days)
Next new moonOctober 20, 1998 at 08:09 (in 2.8 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.

← October 16, 1998 October 18, 1998 →

About the waning crescent

Only a thin sliver is left, visible in the east shortly before dawn, as the cycle prepares to start over with the new moon. The phase name comes from the Moon's position in its 29.53-day cycle: on October 17, 1998 it had completed 90% of the cycle that began with the new moon on September 20, 1998.

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 October 17, 1998. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on October 17, 1998?

On October 17, 1998 the Moon was in its waning crescent phase, with 9% 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: 26.9 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after October 17, 1998 falls on November 4, 1998 at 03:18 Brasília time.

When is the next new moon after that date?

The next new moon after October 17, 1998 falls on October 20, 1998 at 08:09 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.