Lunar Data

Basic Data

Our only satellite, the moon makes a beautiful object to observe as it makes its journey around us. Here, you can find the phase for the month, the rise and set times, and reports showing additional information that may be of use

Remember to send in your observations, images or sketches to share with the rest of the society!

  • Mass: 7.349e+22 kg
  • Mass (Earth=1): 0.012298
  • Equatorial Radius: 1734.4 km (1084 miles)
  • Equatorial Radius (Earth=1): 0.27241
  • Mean Density: 3.34gm/cm3
  • Mean Distance from Earth: 384,400 km (240,250 miles)
  • Rotational Period:27.32166 days
  • Orbital Period: 27.32166 days
  • Avg Lunar Day: 29.53059 days
  • Magnitude: -17.74
  • Axial Tilt: 1.5424 °
  • Orbital Inclination: 5.1454 °

New and Full Moon Tables

Apogee and Perigee Tables

To calculate for a different year, change the value and click 'Calculate'

Year:

Adapted from John Walker of Fourmilab.ch Reproduced with permission

The Perigee and Apogee Table

Click for information on using the Perigee and Apogee table

All dates and times are Universal time (UTC); to convert to local time add or subtract the difference between your time zone and UTC, remembering to include any additional offset due to summer time for dates when it is in effect. For each perigee and apogee the distance in kilometres between the centres of the Earth and Moon is given. Perigee and apogee distances are usually accurate to within a few kilometres compared to values calculated with the definitive ELP 2000-82 theory of the lunar orbit; the maximum error over the years 1977 through 2022 is 12 km in perigee distance and 6 km at apogee.

The closest perigee and most distant apogee of the year are marked with “++” if closer in time to full Moon or “--” if closer to new Moon. Other close-to-maximum apogees and perigees are flagged with a single character, again indicating the nearer phase. Following the flags is the interval between the moment of perigee or apogee and the closest new or full phase; extrema cluster on the shorter intervals, with a smaller bias toward months surrounding the Earth's perihelion in early January. “F” indicates the perigee or apogee is closer to full Moon, and “N” that new Moon is closer. The sign indicates whether the perigee or apogee is before (“−”) or after (“+”) the indicated phase, followed by the interval in days and hours. Scan for plus signs to find “photo opportunities” where the Moon is full close to apogee and perigee.

Reports

These reports can be printed directly from the web page, to help with your observations. They are all timed at 20:00 UTC from Bedford, and are produced from Deep Sky Planner from Knightware
Simple Lunar Ephemeris
Detailed Lunar Ephemeris

Moon Phases

2017 December