Fun fact: Seconds are called seconds because the first breakdown of an hour is the minute, and the second breakdown is the second. Don't ask me the obvious question(s) because I don't know.
If by obvious question you mean “why is it called a minute,” that is because “minute” means “small.” So you have the first minute (small) part and the second minute part of the hour.
That may be relativists (they would actually measure anything in units of mass, with everything else defined through G = c = 1). Astrophysicists commonly measure mass in solar masses, long distances in parsec (or kiloparsec, megaparsec), short distances in solar radii or AU, and time in whatever is relevant to their problem (could be seconds or gigayears)
If you ever find yourself among theoretical physicists and/or astrophysicists and need a conversation starter, just ask about unit systems or unitless/natural measurement systems.
There is no other profession that is more obsessed about that topic.
Yeah true, but I think they actually use wavelength of red shift, which is distance.... traveled by light in the time it takes to make a full cycle. So I guess we're back to seconds again.
I think they use this for distance and time because at scales being dealt with they have the same implications.
They like to set the speed of light to be 1. That is dimensionless 1. It makes their calculations simpler this way instead of dragging some power of c everywhere like a loosely connected trailer on a dirt road.
When i took a particle physics class we measured everything in energy (eV). In this case of measuring everything in seconds, acceration would be measured in units of 1/s