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Hydrus / ˈ h aɪ d r ə s / is a small constellation in the deep southern sky.It was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35-cm (14 in) diameter celestial globe published in late 1597 (or early 1598) in Amsterdam by Plancius and Jodocus Hondius.
Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the surface of the Earth without relying solely on estimated positional calculations, commonly known as dead reckoning.
The Sea or the Water is an area of the sky in which many water-related, and few land-related, constellations occur. This may be because the Sun passed through this part of the sky during the rainy season. [1] Most of these constellations are named by Ptolemy: Aquarius the Water-bearer; Capricornus the Sea-goat; Cetus the Whale; Delphinus the ...
For the first time since 2022, a total lunar eclipse will cause the moon to turn red as it passes through the Earth's shadow. Unlike a total solar eclipse that is visible from only a small area ...
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A star is a massive luminous spheroid astronomical object made of plasma that is held together by its own gravity.Stars exhibit great diversity in their properties (such as mass, volume, velocity, stage in stellar evolution, and distance from Earth) and some of the outliers are so disproportionate in comparison with the general population that they are considered extreme.
With the visible stars revolve stones which are invisible, and for that reason nameless. They often fall on the ground and are extinguished, like the stone star that came down on fire at Aegospotami. showing that the Greeks had a much earlier idea that meteorites are rocks from space. Below is a list of eight confirmed falls pre-1600 AD.
Crater is a small constellation in the southern celestial hemisphere.Its name is the latinization of the Greek krater, a type of cup used to water down wine.One of the 48 constellations listed by the second-century astronomer Ptolemy, it depicts a cup that has been associated with the god Apollo and is perched on the back of Hydra the water snake.