Secondary Minimum
In the light curve of an eclipsing binary, the shallower eclipse
Secondary Mirror ...
in Europe the frequency near the equinoxes rises above that at midwinter, and we have a distinct double period, with a principal minimum at midsummer and a secondary minimum at midwinter.
At many locations, surface turbulence follows a diurnal cycle from a minimum just after sunrise, steeply rising to a peak during early afternoon, declining to a secondary minimum shortly after sunset, ...
A class of eclipsing binaries (see Algol) with periods of from 2 to 5 days, the depth of whose secondary minimum is almost negligible. [H76]
h and Persei ...
The maximum brightness occurs of course when the two are not eclipsed, with each one adding its luminosity to the total output. Two minima also occur: the principal minimum is when the companion blocks out the primary; while a secondary minimum ...
of the binary, as viewed from Earth, temporarily decreases. This is the primary minimum of the binary. Total brightness may also decrease, but less, when the hotter component passes in front of the cooler one; this is the secondary minimum.
 See also: Minimum, Earth, Time, Primary, Total
  
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