Filipino sky watchers will have another treat on Wednesday, March 23, with a “penumbral lunar eclipse”, state astronomers said on Tuesday, March 22.
The Philippine Atmospheric Geophysical and Astronomical Services Administration (Pagasa) said the eclipse would start “when the moon enters penumbra at 5:37 p.m. and ends at 9:57 p.m. (Philippine Standard Time) … It will also be observed in America, Oceania, Australasia and Asia”.
Pagasa said a penumbra was a partially shaded outer region of a shadow that an object casts.
A penumbral eclipse occurs when the moon passes through the faint penumbral portion of the earth’s shadow.
“The lunar surface is not completely shadowed by the earth’s umbra (darkest part of a shadow). Instead, observers can see only the slightest dimming near the lunar limb closest to the umbra. The eclipse may be undetectable unless at least half of the moon enters the penumbra,” it said.