from astroplan import Observer, FixedTarget
from astropy.time import Time
target = FixedTarget.from_name('Sirius')
apo_trig = Observer.at_site('APO', trig_approx=True)
apo = Observer.at_site('APO')
%timeit apo.target_rise_time(Time.now(), target, which='next')
%timeit apo_trig.target_rise_time(Time.now(), target, which='next')
20.5 ms ± 357 µs per loop (mean ± std. dev. of 7 runs, 10 loops each) 8.49 ms ± 34.4 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)