Function look_angles_batch 

pub fn look_angles_batch(
    satellites: &[Satellite],
    stations: &[GroundStation],
    datetime: UtcInstant,
) -> LookAngleGrid

Compute topocentric look angles for all satellite/station pairs at one epoch.

Each cell is produced by calling look_angle_arc for exactly that satellite/station pair with a one-element epoch slice, so the cell is element-wise identical to the scalar kernel.