Recent Advances in Astronomy
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In our eReader you can find the full English version of the book. Read Recent Advances in Astronomy Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Recent Advances in Astronomy
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Bathed in the Sun's rays and containing floating matter capable of scatter- ing them, the atmosphere of Mars would form a luminous shell enshrouding the visible hemisphere of the planet. The line of vision from the Earth directed to the centre of the disc pierces this shell perpendicularly; the portion of its length included in the shell is therefore the least possible, and the illumination of the atmosphere is barely appreciable. The line of sight to the limb, however, meets the visible hemisp...here tangentially, and, traversing the ii2 Recent Advances in Astronomy.
air-shell very obliquely, its intercepted length is great, and the illumination of the air very apparent. From the edge towards the centre of the disc the length of the line of vision involved in the atmos- phere of the planet continually decreases, the appearance of illumination therefore becomes less and less, and the limb-light is the result.
The fading of the planetary features upon ap- proaching the limb is further aided, first, by the fact that as they approach the edge of the visible hemisphere their actual illumination becomes less, as does the terrestrial landscape towards sunset, both from the increasing slant of the Sun's rays and by the greater absorption exercised upon the rays from the greater length of their atmospheric path; 1 and, secondly, from the greater length of the Martian atmosphere through which they are viewed, and the consequent increased absorption exercised upon the rays in retraversing the atmosphere, after reflection from the surface of the planet.
What to read after Recent Advances in Astronomy?
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To quickly assess the difficulty of the text, read a short excerpt:
Bathed in the Sun's rays and containing floating matter capable of scatter- ing them, the atmosphere of Mars would form a luminous shell enshrouding the visible hemisphere of the planet. The line of vision from the Earth directed to the centre of the disc pierces this shell perpendicularly; the portion of its length included in the shell is therefore the least possible, and the illumination of the atmosphere is barely appreciable. The line of sight to the limb, however, meets the visible hemisp...here tangentially, and, traversing the ii2 Recent Advances in Astronomy.
air-shell very obliquely, its intercepted length is great, and the illumination of the air very apparent. From the edge towards the centre of the disc the length of the line of vision involved in the atmos- phere of the planet continually decreases, the appearance of illumination therefore becomes less and less, and the limb-light is the result.
The fading of the planetary features upon ap- proaching the limb is further aided, first, by the fact that as they approach the edge of the visible hemisphere their actual illumination becomes less, as does the terrestrial landscape towards sunset, both from the increasing slant of the Sun's rays and by the greater absorption exercised upon the rays from the greater length of their atmospheric path; 1 and, secondly, from the greater length of the Martian atmosphere through which they are viewed, and the consequent increased absorption exercised upon the rays in retraversing the atmosphere, after reflection from the surface of the planet.
What to read after Recent Advances in Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Henry Fison to read onlineMoreLess
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