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variable
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either:
Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks.
Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it.Many, possibly most, stars have at least some variation in luminosity: the energy output of the Sun, for example, varies by about 0.1% over an 11-year solar cycle.
It goes like this.
I really should get a home charger.
If I get a home charger, I need a variable electricity tariff.
A variable electricity tariff will make my daytime usage more expensive.
The answer is to get a home battery and fill it with cheap electricity overnight.
Look at your roof, if...
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