Penumbra

n. 1. the partially shaded area between full shadow and full light, as in an eclipse; 2. gloom or uncertainty, whether literal or figurative.


Apogee

n. 1. the point in a satellite’s orbit when it is furthest away from the earth; 2. the pinnacle or highest point of achievement


Nostalgia

n. a sentimental fondness for a period in the past.


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