What are the opposite words for solar day solar month?

Solar day and solar month are two related terms in astronomy that refer to units of time based on the Earth's rotation and revolution around the sun. An antonym for solar day could be "lunar day," which is based on the moon's rotation and is about 24 hours and 50 minutes long. An antonym for solar month could be "lunar month," which is based on the moon's revolution around the Earth and is about 29.5 days long. Both lunar day and lunar month are often used in lunar calendars and have their own unique patterns and characteristics. While solar day and solar month are important for understanding our planet's relationship with the sun, lunar time measurements reflect the Earth's connection with the moon.

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Antonym of the day

split down the middle
combine, join.