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Updated: May 4, 2025
At aphelion Mercury is about two and four tenths times hotter than Venus; then it rushes sunward, and within forty-four days becomes six times hotter than Venus. In the meantime the temperature of the latter, while high as compared with the earth's, remains practically unchanged.
The Earth when nearest to the Sun, is in her perihelion; when most distant, in her aphelion. The Moon, with regard to the Earth, is similarly in her perigee, and her apogee. Analogous expressions denoting the relations of the Projectile towards the Moon, would be periselene and aposelene. At its aposelene the Projectile's velocity would have reached its minimum; at the periselene, its maximum.
When Mars is near aphelion he is 61,800,000 miles away, but in his perihelion he gets it down to 33,800,000. That's why we have our golf season while Mars is in his perihelion. It saves us 28,000,000 miles in getting there." I laughed. "You call that handy, do you?" I said. "Why not?" he asked.
The aphelion of a woman's liberty is soon reached, the dark organic forces bind her to tread the narrow orbit of her sex, and if, at the farthest bound of her individual progress, the attraction could fail, and let her slip from the eternal circle, chaos would be the result.
The absence of plant life at the exposed places," he continued, as if lecturing to a class, "can be accounted for here, as nearer the equator, by the violence of the wind; but I greatly doubt whether water will now freeze in this latitude at any season of the year, for, even should the Northern hemisphere's very insignificant winter coincide with the planet's aphelion, the necessary drop from the present temperature would be too great to be at all probable.
Therefore, between the extreme cold of the aphelion and the excessive heat of the perihelion, by the great law of compensation, it is probable that the mean temperature would be tolerably endurable." "At how many degrees is the temperature of the interplanetary space estimated?" asked M'Nicholl.
In the next following section of the orbit the planet rotates through another right angle, but, owing to increased distance from the sun, the motion in the orbit now becomes slower until, when the planet arrives at aphelion, C, the angular difference disappears and the cross is once more just under the sun.
The area of a sphere whose radius is equal to the earth's distance from the sun in aphelion being to the sun's area as 218.1² to 1, while the reflecter of the solar pyrometer intercepts a sunbeam of 3,130 square inches section, it follows that the reflector will receive the radiant heat developed by 3,130 / 218.1² = 0.0658 square inch of the solar surface.
When the earth is nearest the sun she is in her perihelion; and in her aphelion at the farthest point. Speaking of the moon, she is nearest to the earth in her perigee, and farthest from it in her apogee.
The northern Ice-monarch has resumed absolute sway, and our aphelion distance from the sun has increased some tens millions of miles. We have, in the mean time, moved down to the line of the Gulf states, and are deploying to the right in order to make a triumphant entry into Mexico. Mr. Darwin is daily consulting the isochimenals, and is confident that our northern ice-cap will equal Mr.
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