Shift the instrument bodily, meanwhile turning the telescope on the polar axis as necessary, until Polaris is at edge of field as called for by its hour angle, which may be taken from the Nautical Almanac. For example, if Polaris chances to be onanbsp;...
|Title||:||A manual of celestial photography|
|Author||:||Edward Skinner King|
|Publisher||:||Sky Pub Corp - 1988-05|