00496cam a22001454a 4500 0 0 0 0 GGL GGL 2019-04-16 Pak Book Corporation 4451.04 0 523.7 MAC 38460 2019-08-29 00:00:00 1 Riphah international university BK 24416 24416 1852335270 ((pbk) 523.7 MAC Macdonald, Lee How to observe the sun safely New York Springer 2003 ix, 176 p. : ill. ; 23.5 cm. Includes appendix and index. Physics Sun-Observers Position measurement Solar photography Hydrogen-Alpha Solar drawing Observing sun Astronomy Sun RICAS BK