Popular Astronomy, Volume 47Goodsell Observatory of Carleton College, 1939 |
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amateur American appeared Association Astronomical August bright California central changes close comet complete contains continued curves decline determination diameter direction discussion distance early earth eclipse effect equation fact fall field FIGURE give given height important increase indicated interest iron Italy July June known later less light lines longitude magnitude March mass material maximum mean measure meeting metal meteor meteorite method Michigan miles moon motion Mount nature Notes Nova object Observatory observed obtained occur October orbit original path period photographs planet plates popular position possible present probably published radiant recent recorded referred reports rise rotation seems seen Society stars stellar Stone structure surface Table taken telescope Texas theory tion University variable variable stars visible