https://www.bostonglobe.com/2024/09/17/metro/lunar-eclipse-supermoon/
Partial lunar eclipse supermoon double-header to grace the night sky Tuesday
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>>The best time to view the moon partially eclipsed will be from 10:12 p.m. to 11:16 p.m., EDT. During this partial eclipse, the umbra – the shadow’s darkest part – “takes a bite out” of just a fraction of the moon, according to NASA. The darkened area then eventually recedes, never reaching the totality phase.
Francine Jackson, an astronomer with Brown University’s Ladd Observatory in Providence, R.I., said the moon will begin entering the Earth’s outer, lighter shadow — the penumbra — at 8:41 p.m. “The penumbra is so dim in comparison to the umbra that very few persons notice any difference,” she said.
That “slight dimming of the moon will be difficult to notice until the top edge of the moon starts entering the full or primary shadow, the umbra, at 10:13 p.m. (EDT),” according to NASA. The eclipse will peak at 10:44 p.m. with only that top part of the moon plunged into darkness due to the shadow. The moon will then finish exiting the full shadow by 11:16 p.m., bringing Earth’s companion back to complete illumination by midnight.
“Since this partial eclipse only involves about 8.5% of the moon’s diameter entering the Earth’s shadow, Boston observers should look closely at the edge of the lunar disk to see this partial eclipse,” said Jonathan Kemp, with Wellesley College’s Whitin Observatory.
