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17. oldal
It is worth noticing , as showing the scale of solar eruptions , that even such comparatively insig- nificant jets as these are from 25,000 to 30,000 miles in height , while on one or two occasions prominences have been observed as much ...
It is worth noticing , as showing the scale of solar eruptions , that even such comparatively insig- nificant jets as these are from 25,000 to 30,000 miles in height , while on one or two occasions prominences have been observed as much ...
26. oldal
Venus can be observed in inferior conjunction when passing over the Sun's disc ; a phe- nomenon which occurs but seldom , and was never seen until the year 1639 , by Horrox and Crabtree . Halley having , some years after this , pointed ...
Venus can be observed in inferior conjunction when passing over the Sun's disc ; a phe- nomenon which occurs but seldom , and was never seen until the year 1639 , by Horrox and Crabtree . Halley having , some years after this , pointed ...
145. oldal
Sir George Airey , the Astronomer Royal , had some time ago pointed out that the present circumstances of Mars would present a favourable opportunity for determining the sun's distance from the earth by means of observations of the ...
Sir George Airey , the Astronomer Royal , had some time ago pointed out that the present circumstances of Mars would present a favourable opportunity for determining the sun's distance from the earth by means of observations of the ...
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The Music of the Year 1877 | 177 |
English Philanthropy in 1877 | 192 |
Table of all the Public General Acts of Parliament for 1877 | 201 |
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