March 15, 2025
The oldest light in the universe still hums faintly through space, a relic of the beginning itself.
Tololo Totality
Birthday · March 15, 2025
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APOD published March 15, 2025. Credit: Petr Horálek. A publication-date match, not a photo taken on your date. Independent of NASA.
On March 14 the Moon was Full. In an appropriate celebration of Pi day, that put the Moon 3.14 radians (180 degrees) in ecliptic longitude from the Sun in planet Earth's sky. As a bonus for fans of Pi and the night sky, on that date the Moon also passed directly through Earth's umbral shadow in a total lunar eclipse. In clear skies, the colors of an eclipsed Moon can be vivid. Reflecting the deeply reddened sunlight scattered into Earth's shadow, the darkened lunar disk was recorded in this time series composite image from Cerro Tololo Observatory, Chile. The lunar triptych captures the start, middle, and end of the total eclipse phase that lasted about an hour. A faint bluish tint seen just along the brighter lunar limb at the shadow's edge is due to sunlight filtered through Earth's stratospheric ozone layer. Growing Gallery: Total Lunar Eclipse of 2025 March
Image credit: Petr Horálek