The Martian hour will be derived as an entirely new value along with minutes and seconds so trying to impose the average 24 hour values designed for the Earth on to the Lat/Long system of Mars is merely noise from those who are not comfortable with the timekeeping structure for the Earth.

The system of the Earth is clean - 15 degrees of geographical separation equates to 1 hour time difference and much the same for Mars once the Martian values are ascertained from much the same process which created the average 24 hour day and subsequently a rotation rate of 15 degrees per hour via the La/Long system.

Mars has a slightly polar climate bias insofar as the 25.2 degree inclination results in a larger Arctic/Antarctic circle equivalent with slight greater variations in daylight/darkness asymmetries across latitudes. The combination of the surface rotation arising from this orbital motion allied with a fairly rapid daily rotation will produce Equation of Time values vastly different from the Earth's timekeeping facility which reduces variations in natural noon to a 24 hour average.

The structure of timekeeping on Earth is fairly straightforward when divided into the necessary extra day/rotation after four cycles of 365 days/rotation necessary to keep rotations fixed to orbital points. The human input was to format the 1461 rotations for four orbital circuits into a timekeeping structure of equable and continuous 24 hour days into which the Lat/long system and the average 24 hour day fits.

So, it is an exciting opportunity to format a planet with a timekeeping system with its own distinct 24 hour day (equal hours,minutes and seconds) and calendar system similar to the one that works so well on this planet. Mars will have its own leap day once the 24 hour day is established using the sunrise/noon/sunset events that constitute the main milestones for the planet's rotation.

It is one of those things where people suddenly wake up to the possibilities but finding themselves in a swamp of 'day' definitions, don't appreciate the clear route to a system that works for Mars.