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The Penumbra is the shadow that is less darker than the Umbra.

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The Umbra is the darkest shadow of a celestial body.

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When a celestial body is too small to cover the entirety of the light source.

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When a celestial body is located in the umbra.

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When a celestial body is in the umbral and penumbral shadow of the other celestial body.

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Happens in March in the Southern Hemisphere and happens in September in the Northern Hemisphere. It is the first day when a hemisphere has equal nights and equal days.

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Happens in March in the Northern Hemisphere and happens in September in the Southern Hemisphere. It is the first day when a hemisphere has equal nights and equal days.

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When a hemisphere is tilting away from the Sun. The first day of winter.

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When a hemisphere is tilting towards the Sun. The first day of summer.

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When the Sun is at its highest and creates the shortest shadows

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When Earth spins on its axis and causes night and day

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When Earth orbits around the Sun which makes up a year