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Crater Timings

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):

 TU de entrada TU de salida 23:40 Aristarchus 01:51 Grimaldi 23:46 Grimaldi 01:54 Billy 23:48 Kepler 01:58 Campanus 23:50 Plato 01:59 Tycho 23:51 Pytheas 02:08 Kepler 23:53 Timocharis 02:10 Aristarchus 23:55 Copernicus 02:18 Copernicus 23:56 Billy 02:21 Pytheas 23:59 Aristoteles 02:26 Timocharis 00:01 Eudoxus 02:33 Plato 00:07 Manilius 02:36 Manilius 00:10 Menelaus 02:38 Dionysius 00:14 Plinius 02:40 Menelaus 00:15 Campanus 02:42 Eudoxus 00:17 Dionysius 02:43 Aristoteles 00:24 Proclus 02:44 Plinius 00:28 Taruntius 02:47 Goclenius 00:34 Tycho 02:53 Taruntius 00:35 Goclenius 02:54 Langrenus 00:39 Langrenus 02:55 Proclus

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.

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