Perigean spring tide Perigean spring tide A proxigean spring tide (also known as a perigean spring tide) is a tide that occurs three or four times per year when the Moon's perigee (its closest point to Earth during its 29.5-day elliptical orbit) coincides with a spring tide (when the Earth, Sun and Moon are nearly aligned every two weeks). This tide usually adds only a couple of inches to normal spring tides. The Moon's orbit around Earth is elliptical, which causes the Moon to be closer to Earth and farther away at different times. The Moon and the Sun are aligned every two
Sliver of a Full Moon Yale Group for the Study of Native America, Yale Indigenous Performing Arts Program, and Yale Native American Cultural Center. Mary Kathryn Nagle is a visionary playwright and activist. This is an exciting opportunity for our students to meet a vital artist, watch her work, and participate in the process. We very much appreciate the work of all these groups at Yale to bring such an important piece of social and political theatre to our campus and to Santa Fe." Sliver of a Full Moon Sliver of a Full Moon is a play by Mary Kathryn Nagle. The play was written