Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 162
lofthecometof 1861 was 20,000,000 milesin length, but this length hasbeen exceeded in many cases,notably by the tail of thecomet of 1843, which was112,000,000 long, the dia-meter of the coma being112,000 miles, that of thenucleus 400 miles. We have said as a rule,because Halleys comet, asobserved… … Fig^. 20 —Donatis Comet (showingHead and Envelopes). I2S ASTRONOMY. majority of instances, comets increase in brilliancy, andtheir tails lengtlien as they near the Sun, so much so thatin some instances they have been visible in broad day-light. The enormous effect of a near approach to theSun may…
Astronomy · Solar system
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