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# Observation of Earth's shadow on Moon craters during the Lunar Eclipse

Some of the most interesting events to measure during a lunar eclipse are the ingress and egress phases of the Earth's shadow in several lunar craters. The timing of craters is useful in determining the atmospheric enlargement of the Earth's shadow.(See Size and shape of the umbra during a lunar eclipse). The next table lists predicted umbral ingress and egress times for twenty well-defined lunar craters (using 2% umbral enlargement):

 Ingress Time (UT) Egress Time (UT) 01:16 Grimaldi 03:52 Aristarchus 01:20 Billy 03:54 Grimaldi 01:27 Kepler 03:58 Plato 01:28 Aristarchus 03:59 Kepler 01:29 Campanus 04:01 Billy 01:35 Copernicus 04:03 Pytheas 01:38 Tycho 04:04 Timocharis 01:38 Pytheas 04:06 Copernicus 01:44 Timocharis 04:07 Aristoteles 01:52 Manilius 04:09 Eudoxus 01:55 Dionysius 04:13 Campanus 01:55 Plato 04:18 Manilius 01:56 Menelaus 04:21 Menelaus 02:00 Plinius 04:23 Tycho 02:03 Eudoxus 04:25 Plinius 02:04 Aristoteles 04:27 Dionysius 02:06 Goclenius 04:34 Proclus 02:10 Taruntius 04:39 Taruntius 02:12 Proclus 04:43 Goclenius 02:13 Langrenus 04:48 Langrenus

From http://sunearth.gsfc.nasa.gov/eclipse/eclipse.html - F. Espenak, NASA/GSFC

We propose you to follow with us this event and with your collaboration we can find a better measure of Earth's shadow's shape for this eclipse. Remember that shadow's shape is different for every eclipse, so we can not lose this opportunity.

It is easy! You only have to measure ingress and egress times of the selected craters. If the crater is large enough, it will be possible to measure the times of starting and ending of the ingress (and egress) and then calculate the average for every ingress (or egress). If the crater is too small then you can take only one measure in the central position of the crater.

The times in the table are only for orientation. But you can use it with the aim of know what will be the next crater in ingress (or egress). Your measures will have some differences because it depends of atmosphere status in that moment.