solar day

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solar day (plural solar days)

1. (astronomy) One day of solar time; the time in which a planet such as Earth apparently rotates once around its axis relative to the Sun; the time taken for the Sun to seem to be in the same place in the sky twice (on Earth about 24 hours as an average - the length of solar day is not constant throughout the year)

• mean solar day

• solar time

• sidereal day
• stellar day