The Moon Guide
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U. S. N. O.
The phase of the Moon right now

Schools' Moonwatch 2010

Gassendi Credit Peter Grego
17 November 2010 The 11½-day-old waxing gibbous Moon is now north of the celestial equator and becoming more amenable to observation. The morning terminator has pulled back to reveal young impact crater Kepler (32 km) in Oceanus Procellarum, with its grey spindly splash of a ray system.

Now all of Mare Humorum is bathed by the morning sunlight, along with it the magnificent crater Gassendi (114 km) on its northern border. For some reason Gassendi is the Moon’s most frequently observed, sketched and imaged feature. Its floor contains a prominent cluster of central peaks and is crossed with an intricate network of rilles, all easily visible through a 150 mm telescope.

In the southern uplands the crater Schiller (184 km) is an intriguing sight – an elongated feature which gives the impression of being a crater which was squashed from east to west.

Notes by Peter Grego

Reference map
1 Mare Humorum; 2 Gassendi; 3 Schiller.
For a larger map go to

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Mare Crisium
Mare Crisium

MoonWatch evenings

10–11 November 2010

12 November 2010

13 November 2010

14 November 2010

15 November 2010

16 November 2010

17 November 2010

18 November 2010

Jupiter Watch 2010
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