Perigean spring tide Perigean spring tide A proxigean spring tide (also known as a perigean spring tide) is a tide that occurs three or four times per year when the Moon's perigee (its closest point to Earth during its 29.5-day elliptical orbit) coincides with a spring tide (when the Earth, Sun and Moon are nearly aligned every two weeks). This tide usually adds only a couple of inches to normal spring tides. The Moon's orbit around Earth is elliptical, which causes the Moon to be closer to Earth and farther away at different times. The Moon and the Sun are aligned every two
What on Earth! What on Earth! What on Earth! (French: "La Terre est habitée!") is a 1966 National Film Board of Canada animated short co-directed by Les Drew and Kaj Pindal. The film is a mockumentary, introduced in its opening credits as produced by the "National Film Board of Mars" that takes a humorous look at car culture from the point of view of fictional Martians, who mistake automobiles for Earth's true inhabitants and people as their parasites. It attempts to examine the sociology of the automobile as the dominant species on earth, and makes wild guesses about the lifestyle, feeding habits, mating