What allowed Lowell’s long-term observation campaign to proceed according to his own timeline rather than external schedules?

Answer

He was independently wealthy

Lowell was independently wealthy, which meant his observation campaign was not beholden to government grants or university budget cycles, allowing him to follow the Martian calendar.

What allowed Lowell’s long-term observation campaign to proceed according to his own timeline rather than external schedules?
MarsastronomyobservationPercival Lowell