WEBVTT FILE ﻿1 00:00:00.467 --> 00:00:03.303 Roughly every year or two, somewhere in the world 2 00:00:03.503 --> 00:00:07.173 the Sun appears for a few moments as a ring of fire in the sky. 3 00:00:08.174 --> 00:00:10.643 This is called an annular solar eclipse. 4 00:00:11.011 --> 00:00:14.814 Annular comes from the Latin word annulus, which means ring. 5 00:00:15.415 --> 00:00:19.085 An annular solar eclipse occurs when a new Moon passes 6 00:00:19.085 --> 00:00:22.956 directly in front of the Sun, but appears too small to cover it completely. 7 00:00:23.256 --> 00:00:24.557 But why is that? 8 00:00:24.557 --> 00:00:28.094 It's because the Moon's orbit around Earth isn't a perfect circle, 9 00:00:28.128 --> 00:00:30.697 but rather an ellipse or slightly oval-shaped. 10 00:00:31.131 --> 00:00:34.968 This causes the Moon to move closer to us and then farther away 11 00:00:34.968 --> 00:00:36.603 during its month long orbit. 12 00:00:36.603 --> 00:00:39.939 When the Moon is at its closest point called perigee, 13 00:00:39.939 --> 00:00:42.008 it appears slightly larger in our sky. 14 00:00:43.143 --> 00:00:45.712 When it's farthest from us at apogee, 15 00:00:45.712 --> 00:00:47.247 it appears a little smaller. 16 00:00:48.148 --> 00:00:50.450 But we don't see an annular eclipse every month. 17 00:00:50.984 --> 00:00:53.653 That's because the Moon's orbit is also slightly 18 00:00:53.653 --> 00:00:56.589 tilted in relation to Earth's orbit around the Sun. 19 00:00:56.923 --> 00:01:00.827 This means during most months the Moon is either too high or too low 20 00:01:00.827 --> 00:01:02.062 to block the Sun. 21 00:01:02.062 --> 00:01:05.231 So only when a new Moon is at apogee and passes 22 00:01:05.231 --> 00:01:08.768 directly between Earth and the Sun do spectators on Earth 23 00:01:08.768 --> 00:01:12.238 get the rare opportunity to see the ring of fire in the sky. 24 00:01:12.872 --> 00:01:16.042 Unlike a total solar eclipse, when the Moon completely covers 25 00:01:16.042 --> 00:01:20.313 the Sun, during an annular eclipse the Sun never fully disappears. 26 00:01:20.880 --> 00:01:24.651 So if you're lucky enough to be in the path of an annular solar eclipse 27 00:01:24.851 --> 00:01:28.455 make sure to wear your solar eclipse glasses, or use other safe 28 00:01:28.455 --> 00:01:31.791 solar filters to witness this spectacular ring of fire 29 00:01:31.791 --> 00:01:32.692 in the sky.