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Crater Timings

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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):

contcrat1.jpg
TU de entrada
contcrat4.jpg
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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