Currently only Body.Venus is supported.
Mercury's peak magnitude occurs at superior conjunction, when it is impossible to see from Earth,
so peak magnitude events have little practical value for that planet.
The Moon reaches peak magnitude very close to full moon, which can be found using
SearchMoonQuarter or SearchMoonPhase.
The other planets reach peak magnitude very close to opposition,
which can be found using SearchRelativeLongitude.
The date and time after which to find the next peak magnitude event.
Searches for the date and time Venus will next appear brightest as seen from the Earth.