|Occultation of Mars|
The globe of the Earth is centered on the location at the time of conjunction, and shows the footprint of the shadow at intervals on either side of conjunction.
The interval depends on the length of the occultation, with lighter footprints at the start. The first and last footprints are offset by 1s and are drawn in red, which shows where on the Earth the occultation begins and ends.
Note these first and last red footprints are very small.
The Astronomical Almanac Online!!