Please cite SAGA whenever you use it for your publications:

This tool calculates the solar position for requested latitude, date range and daily time range.

Name	Type	Identifier	Constraints
Output
Solar Position	table, output	TABLE
Options
Latitude	degree	LATITUDE	Minimum: -90.000000 Maximum: 90.000000 Default: 53
From	date	DATE_FROM	Default: 2000-01-01
To	date	DATE_TO	Default: 2000-12-31
Step	integer number	DATE_STEP	Minimum: 0 Default: 5
From	floating point number	TIME_FROM	Default: 1
To	floating point number	TIME_TO	Default: 24
Step	floating point number	TIME_STEP	Minimum: 0.000000 Default: 1