I-Spherical trigonometry igatsha lezibalo elibhekene nobudlelwano nezakhiwo zemisebenzi ye-trigonometric ebusweni be-sphere. Kuhilela ukucwaninga ngonxantathu abakhiwe ebusweni bendilinga, abanezakhiwo ezihlukile namafomula uma kuqhathaniswa nonxantathu endizeni. Inkambu ye-trigonometry eyindilinga ibalulekile ekusetshenzisweni okuhlukahlukene, njenge-astronomy, geodesy, kanye nokuzulazula.