Quote:
Originally Posted by mikemasey
So '0' is the bench mark, is that corect and what is the mark. Not the moon as that is far to bright?
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Yes, although it is an open-ended scale. If you read the article that Andrew links to above it mentions Vega as the benchmark star - it was considered as such about 150 years ago or so when they decided on this scale but in our modern times Vega is considered a little bit off 0.0 I wouldn't use the Moon, it varies too much!