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Jupiter at west quadrature on August 1, 2011

31 Jul 2011, 08:01 UTC
Jupiter at west quadrature on August 1, 2011
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The planet Jupiter reaches west quadrature on Monday, August 1, 2011. Any celestial object is said to be at west quadrature whenever it lies 90 degrees west of the sun in our sky.

The planet Jupiter reaches west quadrature tomorrow, on Monday, August 1. Any celestial object is said to be at west quadrature whenever it lies 90 degrees west of the sun in our sky. For example, the moon is always at west quadrature at last quarter moon.
Like the last quarter moon, a planet at west quadrature is seen in the morning sky, usually in the hours between midnight and sunrise. If you’re up during the predawn and dawn hours, it’ll be hard to miss Jupiter. It’s the brightest starlike object to light up the morning sky.Bird's-eye view of the Earth and Jupiter as seen from the north side of solar system plane
Unlike the last quarter moon, Jupiter’s disk won’t look half-lit through the telescope. From our vantage point in the inner solar system, far-off Jupiter always looks full from Earth. However, as viewed from our planet, the shadows of Jupiter and its four major moons – Io, Europa, Ganymede and Callisto – angle out at a ...

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