1974

Handbook of

Astrophotography

for Amateur Astronomers

SECOND EDITION

G.N. Patterson
Saskatoon Centre, R.A.S.C.

Compiled for use as reference material in a course in
Astrophotography

© Copyright Gordon Nelson Patterson 1974, 1981 & 1985

ISBN 0-919677-05-3

The date of this document is uncertain.

A Visit to Two Canadian Craters, by Kenneth E. Chilton.

by K.E. Chilton, Hamilton Centre

For several years, the author has corresponded with Prof. J.M.L. da Silva of the State College of Parana, Curitiba, Brazil, about the variable star RX Lepporis. We agreed that certain of our visual observations were in doubt because of certain irregularities in the published magnitude sequence for stars on the comparison chart, AAVSO chart 050001 W Ori.