Polaris and all that (navigational expedients using elementary astronomy)
Goodman, Neville.
British Astronomical Association.
London British Astronomical Association
1974
'... the presidential address to the Association delivered on 1973 October 31'
'Reprinted from the "Journal of the British Astronomical Association" volume 84, number 2'
Navigation
Nautical astronomy.
Sun.
Walking
Time measurements.
Sun.
Walking