φ, or phi) of a point on Earth's surface is the angle between the equatorial plane and the straight line that passes through that point and through (or close to) the center of the Earth.
φ, or phi) n titbaqqet fal arori n akal eqqal harat wa illan jir equatorial plane d taɣelit toghadat ta hi tikkat ɣur titbaqqet ten d tokay (meɣ tahoz in) s ammas n akal