Termiz davlat universiteti professor A. N. Ro’ziev

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kerrak deryaylik: buning uchun
astrolyabiya     A-      nuktaga
urnatilib, avval ung
tomondagi-yunalishining
magnit azimutidan AV-yuna-
lishning magnit azimuti ayriladi,
natijada {3-burchak aniklaniladi.
Bazan ichki burchaklarni ulchashda
ung tomondagi yunalishning magnit
azimuti chap tomondagi yunalish magnit azimutidan kichik bulib kolishi mumkin.
Bunday xolatda ung tomondagi yunalish magnit azimutiga 360° kushilib, sung ung
tomondagi yunalish magnit azimutidan chap tomondagi yunalish magnit azimuti
ayriladi. M: ung tomondagi yunalish magnit azimuti 45° chap tomondagi yunalish
magnit azimuti 315°deryaylik; bunda 45Q360°-315°q405°-315°q90°.
Astrolyabiya bilan plan olish xam bussol bilan plan olishga uxshash buladi. Lerkin plan
anik chikishi uchun magnit azimutini xakikiy azimutga kerltirib olish kerrak, buning
uchun plani olinayotgan terrritoriyadagi magnit ogishi burchagini anik bilish kerrak
buladi.