WEBVTT 1 00:00:01.060 --> 00:00:04.270 Our planet Earth turns around the Sun in one year. 2 00:00:04.870 --> 00:00:09.500 It takes its natural satellite along with it: the Moon 3 00:00:09.500 --> 00:00:12.900 which turns around the Earth in a little less than a month. 4 00:00:13.389 --> 00:00:16.300 The Moon is also lit up by the Sun 5 00:00:16.300 --> 00:00:21.340 but because it’s moving, we never see it in exactly the same way. 6 00:00:22.010 --> 00:00:25.970 Let’s move closer to the Earth and follow the Moon as we count the days. 7 00:00:27.210 --> 00:00:31.079 Day 1, the Moon is between us and the Sun. 8 00:00:32.079 --> 00:00:33.840 We can’t see it ! 9 00:00:33.840 --> 00:00:37.740 This is normal because it is showing us its dark side. 10 00:00:37.740 --> 00:00:41.190 Its lighted surface is on the other side. 11 00:00:41.190 --> 00:00:44.460 Moreover, on Earth, it’s daylight. The sky is illuminated by the Sun. 12 00:00:44.460 --> 00:00:49.000 The sky is illuminated by the Sun. It’s the New Moon. 13 00:00:50.440 --> 00:00:54.000 The Moon moves slowly along its orbit and after 2 or 3 days 14 00:00:54.000 --> 00:00:57.800 we can begin to see a small part of its surface which is lit up. 15 00:00:58.089 --> 00:01:01.040 It is the Waxing Crescent. 16 00:01:01.040 --> 00:01:04.970 Days and nights go by and the luminous Crescent keeps getting bigger. 17 00:01:06.560 --> 00:01:11.329 About 7 days after the New Moon, half of the Moon is now visible from Earth. 18 00:01:11.960 --> 00:01:14.960 It’s the first quarter. 19 00:01:16.040 --> 00:01:22.200 The following nights, the bright part keeps getting bigger and the Moon can easily be seen at night. 20 00:01:22.290 --> 00:01:25.290 This step in the lunar cycle is called the waxing Gibbous. 21 00:01:27.480 --> 00:01:31.800 Around the 14th day or rather the 14th night 22 00:01:31.800 --> 00:01:33.890 the Sun is behind us. 23 00:01:35.180 --> 00:01:37.740 It is the time of the Full Moon 24 00:01:37.740 --> 00:01:41.280 when the whole bright side of the Moon can be seen from Earth. 25 00:01:42.480 --> 00:01:45.480 The Moon is really bright now in the dark night. 26 00:01:45.480 --> 00:01:49.290 It is even brighter than the stars but it’s not a star. 27 00:01:49.290 --> 00:01:52.290 The Moon only reflects the sunlight to the Earth. 28 00:01:53.870 --> 00:01:59.000 It keeps on turning around the Earth. It’s less and less bright... Seen from the Earth 29 00:01:59.000 --> 00:02:07.600 Three weeks have gone by since the beginning of the cycle and we’re getting nearer the last quarter. 30 00:02:11.490 --> 00:02:13.170 A few more days to go 31 00:02:13.170 --> 00:02:22.500 and the Moon will be back to its original position ready to start a new cycle of 29.5 days. 32 00:02:24.520 --> 00:02:29.230 These different views of the Moon from the Earth are called the lunar phases. 33 00:02:30.300 --> 00:02:35.940 This lunar cycle which never changes has helped Man to find his way in time. 34 00:02:36.850 --> 00:02:39.850 It is the origin of all of our calendars.