The phases of the Moon are caused by the revolution around the Sun the Earth (1) Earth's revolution around the sun
(2) Moon's revolution around the Earth
(3) Moon carving distance from the Earth
(4. Sun's varying distance from the Moon

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;