The moon
The phase is reckoned from the mean synodic month of 29.53059 days, counted from the new moon of 6 January 2000 at 18:14 UTC. The real moon runs up to roughly half a day ahead of or behind this mean. The disc is drawn as seen from the northern hemisphere.
The tide
The tide is a simplified semi-diurnal model: two highs and two lows every lunar day of about 24 h 50 m, with high water set at the moon’s passage and spring tides near new and full moon. It is illustrative only and not for navigation.
The surface
Maria, craters, rays and relief are generated procedurally and lit by the sun’s angle for the chosen date. Earthshine, sunlight bounced back from the Earth, faintly lifts the night side of a young or old moon.