Spectra Precision Survey Pro v4.5 Recon and Nomad User Manual - Manual (Page 152)

User’s Manual – Conventional Mode
142
Solar Observations
The Solar Observation screen is used to compute the azimuth to an
arbitrary backsight based on the position of a celestial body, typically
the sun.
You can either use the time set in the system clock on the Survey Pro
or an external timepiece. Whichever you choose, you should calibrate
it against Coordinated Universal Time shortly before performing the
solar observation. An accurate timepiece is critical when performing
solar observations.
Two solar observation methods are available. One method requires
data taken from an ephemeris and the other method does not. The
example below illustrates performing a sun shot using ephemeris
data since that method requires additional steps.
WARNING!
Direct viewing of the sun without a proper
filter will cause serious eye damage. Pointing a total station
directly toward the sun without a solar filter can also damage the
EDM components.