When a large dish, a space-borne satellite, and the sun are in conjunction, the sun spews enormous streams of incoherent microwaves, called noise, into the dish. The satellite's weak coherent microwave streams become swamped in the rising and falling tides of noise from the sun. It's called either a Solar Transit or a Solar Outage, because it interferes with, or severely degrades, satellite TV viewing.
Transits only occur between sunrise and sunset around the times of semiannual equinoxes.
Interference persists for just a few minutes on the first and last day, lasting for more than a few minutes on the worst day. All of the broadcasting satellites can't be interfered with simultaneously because the sun's spewing disc is too small. However, satellites that are co-located on orbit, will be interfered with at the same times. Transits do not cause interference on uplinks, only on downlinks, so neither your subscription TV service provider nor uplinker can exterminate these fast, harmless pests. The worst day will most probably be March 2 for these places.