text: Pluto’s one of these is always pointed toward Charon, and Mercury’s one of these is twenty degrees west of the crater Hun Kal.
full_question: Pluto’s one of these is always pointed toward Charon, and Mercury’s one of these is twenty degrees west of the crater Hun Kal. Because it has three cloud tops and it is unknown whether or not there is a firm surface, Jupiter does not have one of these. The Carrington Heliographic coordinate system defines this line for the sun as running through the earth as seen on November ninth, 1853. Earth’s one of these lines, as determined at a conference in Washington in 1884, runs through an English city with a namesake mean time, Greenwich. For 10 points, there is nothing north of this line, which is equal to zero longitude and is therefore a terrible thing to tell Alex Trebek.
first_sentence: Pluto’s one of these is always pointed toward Charon, and Mercury’s one of these is twenty degrees west of the crater Hun Kal.