just wondering..//
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answers:
Dump the liberals into Jupiter say: Pluto was last at the perihelion of its orbit on 22 November 1989.
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nineteenthly say: It was last where it is now, loosely speaking, in 1777.
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poldi say: Depends on where you consider the starting point for its orbit.
Pluto takes 248 Earth years to complete one orbit.
It was discovered in 1930.
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Brigalow Bloke say: Right now it is in more or less the same spot as it was 248 years ago.
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Nyx say: when was the last time any planet completed an orbit?
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Spaceman say: Pluto was discovered in 1930. Since it takes 248 years to complete one orbit, it hasn't done so since its discovery. Put another way, it's been 87/248 = 0.35 of a Plutonian year since it was discovered.
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quantumclaustrophobe say: Yesterday.
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Starrysky say: It is in continual orbits. There is no start or stop point to mark when there is a "completed orbit". Earth makes "completed orbits" according to two standards:
Human calendars. Various ones mark a start of an Earth year.
The particular point in its orbit when the "sub-solar point" crosses the Earth s equator going northward. The vernal equinox or first day of spring is an astronomical standard.
Pluto was declared a "dwarf planet" only about a dozen years ago. And Pluto, whatever it is declared, takes about 250 years to go once around the sun. Pluto has gone around the sun about 1/3 of an orbit since it was discovered by Clyde Tombaugh in 1929.
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Alex say: If you call where it is at now as completing its orbit, then the last time it did so was back in 1769 (248 years ago)
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J say: It was early this morning. You must have missed it.
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spot a say: That depends on how you define the starting point. If you take that point as the position it was in when it was first discovered on 18 February 1930, it will not complete an orbit and return to that point until the year 2178, 161 years from now
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