I don't know what is astronamy wise but in the dog world it is the registration for a champion agility dog. My dog's dad has that regestration and one for obedience which is OMCH his name is Karastar Blackjack. He is either #1 or #2 obedience dog in the country! My pup looks so much like him it isn't even funny!
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The Mach number is a measure of the ratio of the speed of an object to the speed of sound in the medium through which the object is traveling. It is used to describe how fast an object is moving compared to the speed of sound. For example, Mach 1 is the speed of sound, so a Mach number greater than 1 indicates supersonic speeds.
This is used to compare the speed of something with the speed of sound; e.g. "mach 3" means 3 times the speed of sound.
the Mach number
Speeds faster than Mach 1 are measured in multiples of Mach, such as Mach 2 (twice the speed of sound), Mach 3 (three times), and so on. Each Mach number represents the speed of an object in relation to the speed of sound.
889 mach is approximately 683,781.4 mph.
Mach 1 (or the speed of sound) is 1,225km per hour Mach 75 is there for 91,875 km/h
Mach 1.4 is approximately 1,062.72 miles per hour.