Early astronomical photographs made in the 1840s were taken using the daguerreotype process, but it was messy (using iodine and bromine vapour, and mercury heated to 75°C) and produced images on metal that could not be copied. It was also relatively insensitive to light, and so was limited to very bright objects like the Sun or Moon.
KeywordsColour Index Photographic Plate Total Solar Eclipse Stellar Magnitude Reference Star
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