Ogologo ọnwa
Ebe dị anya n'ụwa-anyị, ma ọ bụ anya na ụnwanyị, bụ ebe dị anya site na etiti etiti ruo ọnwa . Ogologo ọnwa ( LD ma ọ bụ Δ ⊕ L {\textstyle \Delta _{\oplus L}}  ), ma ọ bụ Earth–Ọnwa dị anya anya, bụ otu ihe atụ na mbara igwe . N'ụzọ nkà na ụzọ, ọ bụ axis nke ọkara isi nke geocentric ụnwanyi orbit . Ogologo ọnwa dị na nkezi ihe dịka 385,000 km (239,000 mi), ma ọ bụ 1.28 ọkụ-sekọnd ; Nke a bụ ihe dị ka dayameta ụwa ugboro 30 ma ọ bụ okpukpu 9.5 gburugburu ụwa. Ihe dị ka ogologo ụbọchi 389 ọgbọ ngalaba mbara igwe nke AU (ihe dị anya site na ụwa ruo mmalite).
A na-nwa anya ụnwanyị ebe dị nso na ihe ụwa dị nso. [1] Lunar ọkara isi axis bụ ihe dị mkpa astronomical datum; nkenke milimita ole na ole nke nha nso a na-egosi nke ọkara isi ruo decimeter ole na ole; ọ nwere ihe ọ na-ekwu maka echiche echiche ndọda dị ka izugbe relativity, [1] na maka imezi echiche mbara igwe ndị ọzọ, dịka oke, [1] radius, [1] na ntụgharị nke ụwa. [1] Ntule bara uru n'ịkọwa ịnwa ụnwa, yana oke na anya na inwe .
. [1][2][3] [1] [2] [3] A na-eme nha milimita nkenke nke anya nke ụnwayọ site n'ịtụ oge ewepụtara maka ọkụ ọkụ laser iji gaa n'etiti ọdụ ụgbọ mmiri dị n'ụwa yana ndị na-anya na-etinye na nwanyị. Ọnwa na-esi n'ụwa na-agbapụ na nke ajụjụ 3.8 cm (1.5 na) kwa afọ, dị ka mgbasara site na Lunar Laser Ranging ngwaọrụ .
- 1 2 Is the Moon moving away from the Earth? When was this discovered? (Intermediate) - Curious About Astronomy? Ask an Astronomer.
- 1 2 C.D. Murray & S.F. Dermott (1999). Solar System Dynamics. Cambridge University Press.
- 1 2 Dickinson, Terence (1993). From the Big Bang to Planet X. Camden East, Ontario: Camden House, 79–81. ISBN 978-0-921820-71-0.