The Moon was full this month on June 22nd, only a day after the northern hemisphere's summer solstice. Since this solstice marked [
http://www.archaeoa
] the northernmost point of the Sun's annual [
http://antwrp.gsfc.
] motion through planet Earth's sky [
http://csep10.phys.
coordinates.html ], the full Moon rising near the ecliptic plane [
http://antwrp.gsfc.
] opposite the Sun was at its farthest south for the year. Only a month earlier, on May 23rd, astronomer Anthony Ayiomamitis recorded this picture [
http://www.perseus.
] of another southerly full Moon rising above Cape Sounion, Greece. The twenty-four hundred year old Temple of Poseidon [
http://www.culture.
] lies in the foreground, also visible [
http://www.utexas.e
lecture01/img2cpsoun wtmp.html ] to sailors on the Aegean Sea. In this well-planned, single exposure, a long telephoto lens makes the Moon loom large, but even without optical aid casual skygazers often find the full Moon [
http://www.astro.wi
] looking astonishingly large when seen near the horizon. That powerful visual effect is known as the Moon Illusion [
http://antwrp.gsfc.
].
Explanation
The Moon was full this month on June 22nd, only a day after the northern hemisphere's summer solstice. Since this solstice marked [
http://www.archaeoa
] the northernmost point of the Sun's annual [
http://antwrp.gsfc.
] motion through planet Earth's sky [
http://csep10.phys.
coordinates.html ], the full Moon rising near the ecliptic plane [
http://antwrp.gsfc.
] opposite the Sun was at its farthest south for the year. Only a month earlier, on May 23rd, astronomer Anthony Ayiomamitis recorded this picture [
http://www.perseus.
] of another southerly full Moon rising above Cape Sounion, Greece. The twenty-four hundred year old Temple of Poseidon [
http://www.culture.
] lies in the foreground, also visible [
http://www.utexas.e
lecture01/img2cpsoun wtmp.html ] to sailors on the Aegean Sea. In this well-planned, single exposure, a long telephoto lens makes the Moon loom large, but even without optical aid casual skygazers often find the full Moon [
http://www.astro.wi
] looking astonishingly large when seen near the horizon. That powerful visual effect is known as the Moon Illusion [
http://antwrp.gsfc.
].
Explanation