Passage: A low Earth orbit (LEO) typically is a circular orbit about 160 to 2,000 kilometres (99 to 1,243 mi) above the earth's surface and, correspondingly, a period (time to revolve around the earth) of about 90 minutes.Kwa sababu ya urefu wao wa chini, satelaiti hizi zinaonekana tu kutoka ndani ya radius ya takriban 1,000 kilometres (620 mi) kutoka kwa sub-satellite point. Kwa kuongezea, satelaiti katika mzunguko wa chini wa dunia hubadilisha msimamo wao kuhusiana na msimamo wa ardhi haraka. Kwa hivyo hata kwa matumizi ya ndani, idadi kubwa ya satelaiti zinahitajika ikiwa ujumbe unahitaji uninterrupted connectivity. Swali: satelaiti hubadilisha mzunguko haraka vipi wakati ziko karibu na ardhi?
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