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The story involves a man's return to Earth after a multi-year contract job on another planet. The Earth he comes back to, however, has undergone a devastating social upheaval. Apparently, a new race of "Synthetic Humans", or "Syns" has been created and is now intent on taking over the world. Meanwhile, the real humans are trying to destroy them.
Daytime or day as observed on Earth is the period of the day during which a given location experiences natural illumination from direct sunlight. Daytime occurs when the Sun appears above the local horizon, that is, anywhere on the globe's hemisphere facing the Sun. In direct sunlight the movement of the sun can be recorded and observed using a ...
Derivative of −Δt. The axis on the right shows the length of the solar day. For Earth, the synodic day is not constant, and changes over the course of the year due to the eccentricity of Earth's orbit around the Sun and the axial tilt of the Earth. [3] The longest and shortest synodic days' durations differ by about 51 seconds. [4]
A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, afternoon, evening, and night. This daily cycle drives circadian rhythms in many organisms, which are vital to many life processes.
Get your free daily horoscope, and see how it can inform your day through predictions and advice for health, body, money, work, and love.
A lunar day is the time it takes for Earth's Moon to complete on its axis one synodic rotation, meaning with respect to the Sun. Informally, a lunar day and a lunar night is each approx. 14 Earth days. The formal lunar day is therefore the time of a full lunar day-night cycle.
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In astronomy, a syzygy (/ ˈ s ɪ z ə dʒ i / SIZ-ə-jee; from Ancient Greek συζυγία (suzugía) 'union, yoking', expressing the sense of σύν (syn-"together") and ζυγ- (zug-"a yoke") [1] [2]) is a roughly straight-line configuration of three or more celestial bodies in a gravitational system.