Sunrise-sunset calculator

GNU Octave can be used as a programmable calculator. Here, you can download an Octave script that can calculate sunrise and sunset time for any location on earth.

The algorithm used is from here.

When I run the script for Mumbai, I get the following output at Octave prompt: I use the command “diary” (How to use “diary”?) to record these results.

```Give year number: 2015
year =  2015
Give month number: 7
month =  7
Give date: 10
date =  10
Give longitude of your location in deg: 72.8258
longitude =  72.826
Give latitude of your location in deg: 18.975
latitude =  18.975
=============================================
Here is the Sunrise time:
rise_hours =  6
rise_minutes =  13.920
rise_seconds =  55.173
=============================================
Here is the Sunset time:
set_hours =  19
set_minutes =  11.924
set_seconds =  55.455
=============================================

```