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Diffstat (limited to '')
| -rw-r--r-- | src/solar.py | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/solar.py b/src/solar.py index ef74c08..d3c19f5 100644 --- a/src/solar.py +++ b/src/solar.py @@ -516,7 +516,7 @@ def past_equinox(t = None): # TODO document def future_past_solstice(delta, t = None): e = 0.00001 - fun = lambda t : (solar_declination(t - e) - solar_declination(t + e)) / 2 + fun = lambda t : (solar_declination(t + e) - solar_declination(t - e)) / 2 return solar_prediction(delta, 0, fun, t = t) @@ -570,6 +570,20 @@ def past_elevation(latitude, longitude, elevation, t = None): return future_past_elevation(0.01 / -2000, latitude, longitude, elevation, t) +def future_past_elevation_derivative(delta, latitude, longitude, elevation_derivative, t = None): + fun = lambda t : solar_elevation(latitude, longitude, t) + dfun = lambda t : (fun(t + e) - fun(t - e)) / 2 + return solar_prediction(delta, elevation_derivative, dfun, t = t) + + +def future_elevation_derivative(latitude, longitude, elevation_derivative, t = None): + return future_past_elevation_derivative(0.01 / 2000, latitude, longitude, elevation_derivative, t) + + +def past_elevation_derivative(latitude, longitude, elevation_derivative, t = None): + return future_past_elevation_derivative(0.01 / -2000, latitude, longitude, elevation_derivative, t) + + # TODO: This algorithm is imprecise, gives an incorrent sunrise and I do not fully know its behaviour def sunrise_equation(latitude, longitude, t = None): j_cent = julian_centuries() if t is None else t |