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Moon Rise And Set Calculator

Work out moon rise and set instantly with clear inputs, formula shown and shareable results.

About Moon Rise And Set Calculator

The Moon rises on average 50 minutes later each day because it moves about 13 degrees eastward daily against the stars. Tracking days since a known new moon gives its age within the 29.53 day synodic month, and the phase then predicts roughly when it rises: new near sunrise, first quarter near midday, full near sunset.

Formulas

Moon age

age = days since a known new moon, modulo 29.530589

Daily rise lag

about 50 minutes later each day

Worked example

With the default values below, Moon Rise And Set Calculator returns Moon Age Since New of 27.33. Change any input above and every figure here is recalculated in your browser.

Inputs used

Date
2026-04-15
Latitudeaccepts -66–66 deg
51.5 deg

Results

Moon Age Since New
27.33 days
Approximate Rise Time
4.77 h
Approximate Set Time
17.17 h
Phase And Visibility
Waning crescent - rises after midnight

Step by step

  1. 1Values used
  2. 2Moon age
  3. 3Daily rise lag
  4. 4Moon Age Since New= 27.33 days
  5. 5Approximate Rise Time= 4.77 h
  6. 6Approximate Set Time= 17.17 h
  7. 7Phase And Visibility= Waning crescent - rises after midnight

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does the Moon rise later each day?

Because it orbits Earth eastward, so the Earth must turn a little further each day to bring it back to the horizon.

How accurate is this estimate?

It gives the phase within a day and rise time within an hour or two. Precise times need the Moon's declination and orbital eccentricity.

Related Calculators

Moon Rise And Set Calculator – Calculate Moon Age Since New