rille

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rille

Ariadaeus, a lunar rille, photographed in 1969 by the crew of Apollo 10

rille

also rill (rĭl)

1. A long, narrow, roughly straight channel or groove on the surface of a solar system body like a planet or moon.

2. Variant of rill.

[German Rille; see rei- in Indo-European roots, from Low German rille; see rei- in Indo-European roots.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

rille

(rɪl)

(Astronomy) a variant of rill³

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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References in periodicals archive ?

Neison's map of the eastern rille shows five pits along its length, but none are in Madler's.

Observing history: challenge yourself to see as well as the best 19th-century lunar cartographers

This 11-kilometer-wide rimless pit resides at the juncture of the two arms of a rille known as Rima Hyginus, in the east end of Sinus Medii.

A lunar volcanic crater: few large volcanic craters are visible on the Moon... except this one

In these cases, ash erupted from a rille or a V-shaped depression with tapered ends.

Hints of vents: track down the volcanic sources of the lunar maria

Some of us in the Lehigh Valley Amateur Astronomical Society dubbed it "the Teardrop Rille" due to its droplike look.

Observing the moon's rilles

In fact, the floor fractured, producing a delicate rille where the lower half of the crater tilted inward.

Tilting inward: track down craters that were influenced by their surrounding terrain

Sinuous rilles, such as Hadley Rille, mark locations where rapidly flowing lavas cut winding channels.

History of the Moon: how do we know when things happened?

When the seeing is excellent, I can occasionally spy a thin rille that bisects the crater floor from east to west.

Lunar highs and lows: an online tool lets you measure a crater's depth

At the telescope you can observe that the end of the rille Rima Hyginus abruptly stops when it reaches the southeast edge of Mare Vaporum, showing that those lavas are younger than the rille.

Three holes in a row: but one is a lava-filled lunar basin that we didn't realize was there

But no vents are visible, even in high-resolution LRO images, so the explosive activity that laid down the dark deposits probably came from eruptions along the rille's 300-km length.

Humorum in the eyepiece: here's a medium-size lunar basin that's packed with interesting geologic features observable through your telescope

Rima Sirsalis is a straight rille that has a surprisingly big bend near the crater De Vico A.

Twin basins with a twist: track down two big basins--one obvious and the other nearly invisible

Very close to the mountain scarp is Hadley Rille. The Apollo crew landed near the north end of the rille, just where it bends toward the west.

Footprints on the moon: use your telescope to explore the apollo landing sites

The model features a teardrop shaped fuel tank, open shaft drive, cantilever suspension, 21-inch front and 18-inch rear wheel, with Metzeler Rille tyres.