diff options
Diffstat (limited to 'info/blueshift.texinfo')
| -rw-r--r-- | info/blueshift.texinfo | 70 |
1 files changed, 67 insertions, 3 deletions
diff --git a/info/blueshift.texinfo b/info/blueshift.texinfo index be30aad..4b3dce1 100644 --- a/info/blueshift.texinfo +++ b/info/blueshift.texinfo @@ -1372,6 +1372,15 @@ geographical position (@code{latitude}, @code{longitude}). Calculates the same thing as @code{solar_elevation_from_time}, except the time is optional and defaults to the current time. +@item have_sunrise_and_sunset(latitude, t = None) +Determine whether you have sunrise and sunsets. + +@item is_summer(latitude, t = None) +Determine whether it is summer. + +@item is_winter(latitude, t = None) +Determine whether it is winter. + @item future_past_elevation(delta, latitude, longitude, elevation, t = None) Calculates the next or previous point in time the Sun's elevation will be @code{elevation} degrees or was @@ -1379,12 +1388,12 @@ elevation will be @code{elevation} degrees or was (@code{latitude}, @code{longitude}). The calculated timepoint may actually be the current time, @code{t}. If not time point can be found within a Julian year -@code{None} will be returned. This function uses -interpolation to determine time point, because inverting +@code{None} will be returned. This function uses binary +search to determine time point, because inverting @code{solar_elevation} is unfeasible to do algebraically; @code{delta} specified the size of the steps between the timepoints that are tested to determine the timespan in -which to do the interpolation. +which to do the binary search. @item future_elevation(latitude, longitude, elevation, t = None) Calculates the next point in time the Sun's elevation will @@ -1401,6 +1410,61 @@ Calculates the previous point in time the Sun's elevation was timepoint may actually be the current time, @code{t}. If not time point can be found within a Julian year @code{None} will be returned. This function uses + +@item future_past_elevation_derivative(delta, latitude, longitude, derivative, t = None) +Similar to @code{future_past_elevation}, but calculates the +time point for a first derivative of the solar elevation. + +@item future_elevation_derivative(latitude, longitude, derivative, t = None) +Similar to @code{future_elevation}, but calculates the +time point for a first derivative of the solar elevation. + +@item past_elevation_derivative(latitude, longitude, derivative, t = None) +Similar to @code{past_elevation}, but calculates the +time point for a first derivative of the solar elevation. + +@item future_past_equinox(delta, t = None) +Similar to @code{future_past_elevation}, but calculates the +time point for an equinox. The result cannot be @code{None}. + +@item future_equinox(t = None) +Similar to @code{future_elevation}, but calculates the +time point for an equinox. The result cannot be @code{None}. + +@item past_equinox(t = None) +Similar to @code{past_elevation}, but calculates the +time point for an equinox. The result cannot be @code{None}. + +@item future_past_solstice(delta, t = None) +Similar to @code{future_past_elevation}, but calculates the +time point for a solstice. The result cannot be @code{None}. + +@item future_solstice(t = None) +Similar to @code{future_elevation}, but calculates the +time point for a solstice. The result cannot be @code{None}. + +@item past_solstice(t = None) +Similar to @code{past_elevation}, but calculates the +time point for a solstice. The result cannot be @code{None}. + +@item solar_prediction(delta, requested, fun, epsilon = 0.000001, span = 0.01, t = None) +Predict the time point of the next or previous +time an arbitrary condition is meet by way of +binary searching. This conditions is satisfied if +@code{fun} of a timepoint equals @code{requested} +with a tolerance of @code{epsilon}. +@code{delta} specified the size of the steps between the +timepoints that are tested to determine the timespan in +which to do the binary search. This timespan is limited +to @code{span} with is a timespan in Julian Centuries; +0,01 is approximately one Gregorian year. +If no satisfactory timepoint can be found +within the specified span @code{None} is returned. + +@item ptime(t) +Prints a time, input in the Julian Centuries format, +as a human-readable local time. + @end table For all functions beneath @code{degrees}, @code{t} is the |