Tuzzya n tfukt d amsekni yettbeddilen s unect n tehri taraklant acku tafukt d tin igebren seg plasma tagazawt. Isig n tuzzya yettili d afellay deg usebges n tfukt (Tehri n φ=0o), tazzla ayi tettedras (tettenqas) yal mi ara ad ternu tehri. Dɣa tuzzya taneẓlayt n tfukt tettwaglam-d s tegda ayi: ω = A + B sin 2 ⁡ ( φ ) + C sin 4 ⁡ ( φ ) {\displaystyle \omega =A+B\,\sin ^{2}(\varphi )+C\,\sin ^{4}(\varphi )} Anda: ω : d arured uɣmir yettwastgen s tseddart/ass. φ: d tehri tanafukt, tettwasteg s tseddart. A,B,C : d timezgitin tisengamin. Atig n tmezgitin A,B,C mgaraden s unect n tarrayt yettusmersen i wakat d tanzagt takudant yettuzrawen. Imir-a, Atigen (azalen) imnummsanen yettwaddgen i tmezgitin-a ttunefken-d s: A= 14.713 deg/day ± 0.0491.B= –2.396 deg/day ± 0.188.C= –1.787 deg/day ± 0.253. Tuzzya tasnallant Tuzzya tagensawt n tfukt Ẓeṛ daɣen == Imniren ==