These are my references text books for all informations appear in my sketches session
STARWARE by Harrington: This is my first book. It is very useful for beginner,
start from basic knowledge of telescope end up with observing/sketching.
Touring the Universe through Binoculars by Harrington: I use Chapter 2 for Moon
observing information. Table 6.1 show 103 messier objects that can be seen through
Binoculars and classify difficulty rating of each object
TURN LEFT AT ORION by Consolmagno and Davis: give the guideline "how
they look like when see through small telescope', also classify the impression rating
of each object
Deep-Sky Companions: The Messier Objects by O'Meara: The completed information
including superb sketches. It quite difficult to compare my sketches against this text book
due to much more details that can't be seen at my home site.
BURNHAM'S CELESTIAL HANDBOOK (Volume 1, 2 & 3): Good reference taxt,
interestingly descriptions, excellent definition of amateur astronomer in introduction (vol.1)
Sky Atlas 2000.0 Companion by Strong & Sinnott: for latest information of all 2,700
deep-sky objects in Sky Atlas 2000.0
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