Calendar

March’s Full Moon is the “Lenten Moon”, “Worm Moon”, “Crow Moon”, “Crust Moon”, “Sugar Moon”, “Sap Moon”, “Chaste Moon”, or “Holi”.

The date (near March 21 in the northern hemisphere) when night and day are nearly the same length and Sun crosses the celestial equator (i.e., declination 0) moving northward. In the southern hemisphere, the vernal equinox corresponds to the center of the Sun crossing the celestial equator moving southward and occurs on the date of the northern autumnal equinox. The vernal equinox marks the first day of the season of spring.

http://scienceworld.wolfram.com/astronomy/VernalEquinox.html

April’s Full Moon is the “Egg Moon”, “Pink Moon”, “Sprouting Grass Moon”, “Fish Moon”, “Seed Moon”, “Waking Moon”, or “Hanuman Jayanti”.

May’s Full Moon is the “Milk Moon”, “Flower Moon”, “Corn Planting Moon”, “Hare’s Moon”, or “Buddha Poornima”.

June’s Full Moon is the “Flower Moon”, “Strawberry Moon”, “Honey Moon”, “Rose Moon”, “Hot Moon”, “Planting Moon”, or “Wat Poornima”.

In the northern hemisphere, the longest day of the year (near June 22) when the Sun is farthest north. In the southern hemisphere, winter and summer solstices are exchanged. The summer solstice marks the first day of the season of summer. The declination of the Sun on the (northern) summer solstice is known as the tropic of cancer (23° 27′).

http://scienceworld.wolfram.com/astronomy/SummerSolstice.html