👉 In the context of astronomy, a "seminocturnal" refers to a celestial event that occurs when the Earth is directly overhead at a time during the night. This can happen on specific days of the year and varies depending on local astronomical conditions. For example, in the month of November or December (depending on the latitude), the Earth's shadow shifts from being below the horizon to being above it, creating an "seminocturnal" effect. This occurs because of the tilt of the
