The Large Binocular Telescope, or LBT, has the unique capability to perform this interferometry, as it is designed so that its twin telescopes can each detect light waves that are
perfectly out of phase with each other.
Not exact matches
Using green LEDs, they mimicked the flashing
of male fireflies, with patterns ranging from
perfectly in synch to almost entirely
out of phase.
No one is
perfectly suited for every
phase of a child's development, so we're all fish
out of water at some point.
Many
of the dating games men play start
out with a
perfectly great opening
phase.
During the partial
phase, the sun, Earth and moon are not quite
perfectly aligned, and Earth's shadow appears to take a bite
out of the moon.
The vast majority
of the time, this behavior is
perfectly harmless, and should be
phased out by engaging him in the basic training and socialization techniques you're hopefully planning on conducting already.