Abstract
ADVANTAGE has been taken of the recent very favourable opposition of Mars to make a close examination of the surface features. The 9 in. Cooke photo-visual refractor has been employed, usually with a magnification of 250. A fortnight of reasonably clear weather at the end of July assisted considerably, and nearly one hundred drawings of the disk have been made. The following is a summary of the chief points of interest revealed by these:
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GEDDES, M., THOMSEN, I. Surface Features of Mars at the Recent Opposition. Nature 144, 944 (1939). https://doi.org/10.1038/144944b0
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DOI: https://doi.org/10.1038/144944b0
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