If the solar constant is really dropping like that, things out here will be pretty bad, too.

After various corrections, the value of the solar constant could be calculated.

The rate of decline in the solar constant's worse than we figured or could believe."

These measurements show that the solar constant is not constant.

The solar constant is thus expressed at the thermopause.

During that time the solar constant may vary by about two per cent---certainly no more."

The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight.

But there was the slight matter of a drop in the solar constant of an unimportant Sol-type sun, and nothing could come of it.

The luminosity, mass, and radius of stars are often represented using the corresponding solar constants as units of measurement.

Since Mercury's solar constant is 6.5 times higher than Earth's, energy for the mass driver should be easy to come by, and solar sails near Mercury would have 6.5 times the thrust they do near Earth.

At this stage the solar constant of the sun was only about 73% of its current value, but liquid water may have existed on the surface of the Proto-earth, probably due to the greenhouse warming of high levels of methane and carbon dioxide present in the atmosphere.

"The situation, as briefly as possible, is this: "As you re all too well aware, the solar pulsation cycles have been getting increasingly out of phase in the last century or so, and the solar constant has risen by as much as a thousandth of a percentage point.

To check and confirm the small variations in the solar constant found at these two sites, Abbot received a grant from the National Geographic Society in March 1925 to select a site for a third solar observatory, equip it, and carry out observations for a few years.

The solar constant does not remain constant over long periods of time (see Solar variation), but over a year varies much less than the variation of direct solar irradiance at the top of the atmosphere arising from the ellipticity of the Earth's orbit.