Big Dipper

Saturn (magnitude 0.4, apparent size 19.3") is at opposition at 0:00 UT.

New Moon (lunation 1092) occurs at 14:32 UT.

At 1am UT/GMT all clocks in the UK go forward by one hour to 2am to mark the start of British Summer Time (BST).

The Moon is 1.2 degrees south of the bright open cluster M35 in Gemini at 19:00 UT.

Wonders of the Universe Professor Brian Cox reveals how the most fundamental scientific principles and laws explain not only the story of the universe, but the story of us all.

700 Not Out! Sir Patrick Moore celebrates the 700th episode of The Sky at Night at his home in Sussex, with the help of special guests Professor Brian Cox, impressionist and amateur astronomer Jon Culshaw and Lord Martin Rees, the Astronomer Royal. A stellar panel of astronomers gathers to answer vexing questions from the viewers, while Sir Patrick has a close encounter with his younger self.

700 Not Out! Sir Patrick Moore celebrates the 700th episode of The Sky at Night at his home in Sussex, with the help of special guests Professor Brian Cox, impressionist and amateur astronomer Jon Culshaw and Lord Martin Rees, the Astronomer Royal. A stellar panel of astronomers gathers to answer vexing questions from the viewers, while Sir Patrick has a close encounter with his younger self.

Neptune is 5 degrees south of the Moon at 2:00 UT; Venus is 6 degrees south of the Moon at 13:00 UT.

The Curtiss Cross, an X-shaped illumination effect located between the craters Parry and Gambart, is predicted to occur at 6:07 UT.

Venus is 0.1 degrees south of Neptune at 0:00 UT.

Last Quarter Moon occurs at 12:07 UT.

Mercury is at its greatest eastern elongation (19 degrees) at 1:00 UT.

Saturn is 8 degrees north of the Moon at 0:00 UT; Uranus is in conjunction with the Sun at 12:00 UT.

The vernal equinox occurs at 23:21 UT.

Full Moon (known as the Crow, Lenten, and Sap Moon), the largest of 2011, occurs at 18:10 UT.

Mercury (magnitude -1.0) is 2 degrees north of Jupiter (magnitude -2.1) at 17:00 UT.

The dark limb of the Moon occults the 3rd magnitude star Eta Geminorum at 21:07 GMT on the 13th in the mid-UK (time varies slightly with location), causing it to apparently wink out of existence. It reappears from behind the bright limb of the Moon an hour later. (Quote by Ian Morison at http://www.astronomy.co.uk/skytonight)

First Quarter Moon occurs at 23:45 UT.

The Lunar X (also known as the Purbach or Werner Cross), an X-shaped illumination effect involving various rims and ridges between the craters La Caille, Blanchinus, and Purbach, is predicted to occur at 5:24 UT.

The Moon is 1.7 degrees south of the bright open cluster M45 (the Pleiades) in Taurus at 5:00 UT.

Jupiter is 7 degrees south of the Moon at 5:00 UT.

New Moon (lunation 1091) occurs at 20:46 UT.

Venus is 1.6 degrees south of the Moon at 4:00 UT.

Asteroid 4 Vesta (magnitude 7.0) is 0.9 degree north of the Moon, with an occultation taking place from Antarctica and the southern Pacific, at 0:00 UT.

The Curtiss Cross, an X-shaped illumination effect located between the craters Parry and Gambart, is predicted to occur at 16:42 UT.