viewing azimuth angle derivations

1. viewing azimuth angle from sensor azimuth angle

   symbol	description	unit	variable name
   \(\varphi_{S}\)	sensor azimuth angle	\(deg\)	sensor_azimuth_angle {:}
   \(\varphi_{V}\)	viewing azimuth angle	\(deg\)	viewing_azimuth_angle {:}

   The pattern : for the dimensions can represent {time}, or no dimensions at all.

   \[\varphi_{V} = 180 - \varphi_{S}\]