Function look_angle_batch_serial 

pub fn look_angle_batch_serial(
    satellites: &[Satellite],
    ground_station: GroundStation,
    datetimes: &[UtcInstant],
) -> Vec<Result<Vec<LookAngle>, LookAngleError>>

Topocentric look angles for many already-initialized SGP4 satellites over a shared epoch grid, serially.

Element i is the look-angle arc for satellites[i] from ground_station, exactly as look_angle_arc would produce it. The serial reference for look_angle_batch_parallel.