The optical light curve shows that OJ 287 has a periodic variation of 11 12 years with a narrow double peak at maximum brightness.
12.
In 1944 the periodic variations broke off, and RR Tel brightened by more than 7 magnitudes over the course of about four years.
13.
In 1967, Beta Centauri's observed periodic variation in radial velocity suggested that Beta Centauri A is a double-lined spectroscopic binary.
14.
This was based on observations of periodic variations in light and dark patches, particularly in the polar latitudes, which looked like seas and continents.
15.
I understand that this is a bland, boring decision, but Wikipedia's ideals shouldn't be violated for periodic variations of the logo.
16.
The various gravity assists form visible peaks on the left, while the periodic variation on the right is caused by the spacecraft's orbit around Saturn.
17.
The solar cycle was discovered in 1843 by Samuel Heinrich Schwabe, who after 17 years of observations noticed a periodic variation in the average number of sunspots.
18.
The ellipsoidal variations are also thought to be created in binary systems, in this case contact binaries where distorted stars cause strictly periodic variations as they orbit.
19.
Since the fixed SME background fields are coupled with the particle fields, periodic variations associated with these motions would be one of the signatures of Lorentz violation.
20.
A grating is defined in Born and Wolf as " any arrangement which imposes on an incident wave a periodic variation of amplitude or phase, or both ".
