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astro.py: add docstrings. #1

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6 changes: 6 additions & 0 deletions pytides/astro.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,14 @@ def d_polynomial(coefficients, argument):

# Meeus formula 11.1
def T(t):
"""Return the Julian Century of a datetime.
Per Meeus's Astronomical Algorithms, formula 11.1"""
return (JD(t) - 2451545.0)/36525

# Meeus formula 7.1
def JD(t):
"""Return the Julian Date of a datetime.
Per Meeus's Astronomical Algorithms, formula 7.1"""
Y, M = t.year, t.month
D = (
t.day
Expand Down Expand Up @@ -155,6 +159,8 @@ def _nupp(N, i, omega):
AstronomicalParameter = namedtuple('AstronomicalParameter', ['value', 'speed'])

def astro(t):
"""Return the astronomical parameters of a datetime.
"""
a = {}
# We can use polynomial fits from Meeus to obtain good approximations to
# some astronomical values (and therefore speeds).
Expand Down