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Moon Phases Calendar May 1851
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Interactive moon phases tool
Ready to explore other moon phases? This tool shows the current moon phase and allows you to shift the phases and see how the moon is illuminated at each phase.
Credit: NASA
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
Thursday, May 1st, 1851
New Moon 2
Friday, May 2nd, 1851
Waxing Cresent 3
Saturday, May 3rd, 1851
Waxing Cresent 4
Sunday, May 4th, 1851
Waxing Cresent 5
Monday, May 5th, 1851
Waxing Cresent 6
Tuesday, May 6th, 1851
Waxing Cresent 7
Wednesday, May 7th, 1851
Waxing Cresent 8
Thursday, May 8th, 1851
First Quarter 9
Friday, May 9th, 1851
Waxing Gibbous 10
Saturday, May 10th, 1851
Waxing Gibbous 11
Sunday, May 11th, 1851
Waxing Gibbous 12
Monday, May 12th, 1851
Waxing Gibbous 13
Tuesday, May 13th, 1851
Waxing Gibbous 14
Wednesday, May 14th, 1851
Waxing Gibbous 15
Thursday, May 15th, 1851
Full Moon 16
Friday, May 16th, 1851
Full Moon 17
Saturday, May 17th, 1851
Waning Gibbous 18
Sunday, May 18th, 1851
Waning Gibbous 19
Monday, May 19th, 1851
Waning Gibbous 20
Tuesday, May 20th, 1851
Waning Gibbous 21
Wednesday, May 21st, 1851
Waning Gibbous 22
Thursday, May 22nd, 1851
Waning Gibbous 23
Friday, May 23rd, 1851
Last Quarter 24
Saturday, May 24th, 1851
Last Quarter 25
Sunday, May 25th, 1851
Waning Cresent 26
Monday, May 26th, 1851
Waning Cresent 27
Tuesday, May 27th, 1851
Waning Cresent 28
Wednesday, May 28th, 1851
Waning Cresent 29
Thursday, May 29th, 1851
Waning Cresent 30
Friday, May 30th, 1851
New Moon 31
Saturday, May 31st, 1851
New Moon 
Moon phases software screen saver.
If you are interested in the phases of the moon or you like night sky screensavers, download the StarMessage screensaver for Microsoft Windows and Apple MacOS (including Mojave and Catalina).
The screensaver displays the moon in its current moon phase, reminds you about the upcoming full moon dates, shows you the names of the full moon, and does much more.
Diagram explaining the moon phases
This diagram shows the relative positions of the Sun, the Moon and earth and explains how the different moon phases appear.
The visible part of the moon is the part of the moon's surface that gets hit by the sunlight. The rest of the moon disc is almost invisible.
The moon phases are not caused by the shadow of the earth on to the moon. It is the moon's own shadow at the part of its surface that is not hit by the sunlight.
In other words, the visible "sunny" part is made of the places where there is "day" on the moon and the shadow part is where there is "night".
Credit: NASA/JPL-Caltech.