Hitchhiker's Guide to Rukl Chart 10

Sinus Iridum (JRF <freeman _at_ netcom.com>)
The Bay of Rainbows lies on the northwest edge of the Sea of Rains. The Jura mountains form its boundary, and they are high enough to be illuminated by the rising sun while the floor of the bay yet lies in darkness. As the terminator progresses westward, the mountains light up, first at Promentory Laplace, then subsequently at Promentory Heraclides, then the two sunlit portions join, making a semicircle of light that rings the bay. This brilliant arc almost suggests the rainbows for which the feature was named.

Morio Higashida has a nice image of Sinus Iridum.

Sinus Iridum on the dark side of the moon (Randy Muller <71172.1234 _at_ compuserve.com>)
[Observing the dark side of the crescent moon ...] The region north and west of Mare Imbrium, in which Sinus Iridum and Plato are embedded was very prominent.
Wrinkle Ridges (JRF <freeman _at_ netcom.com>)
At low sun angles, note the long, prominent wrinkle ridges that cross the mouth of Sinus Iridum and trend southward, past the crater Caroline Herschel, through Lambert and all the way to the Carpathians (Rukl chart 20).

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This page last modified: Oct 03, 2011
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