An annular solar eclipse occurred at the Moon's ascending node of orbit on Saturday, May 31, 2003, with a magnitude of 0.9384. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Occurring about 2.6 days after apogee, the Moon's apparent diameter was smaller.