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A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [1] They have been used for human navigation since time immemorial. [2]
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight , starlight , and airglow , depending on location and timing.
Star Walk can also display the times of sunrise and sunset for the Sun (and other visible planets) at a particular location, as well as the current moon phase, elevation angle, and day length. The app can show the map of the night sky in the past and future.
A parade of planets occurs when several planets are visible in the night sky at once, and appear to form a line. "The planets will orbit the sun in roughly the same plane (called the ecliptic ...
The planets will stretch from the horizon line to around halfway up the night sky. But don't be late: Mercury and Jupiter will quickly dip below the horizon around half an hour after sunset.
In late March 2023, five planets will all be visible in the night sky. This rare alignment is guaranteed to be beautiful—here's how to watch it.
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