Starship Flight 7

Can someone please please PLEASE tell SpaceX PR/Streaming team that the speed (per SI system) is measured in meters per second, not kilometers per hour? The speed of sound is approx 300 m/s, orbital velocity is approx 8,0000 m/s (depending on altitude), free fall acceleration on Earth is 9.81m/s, 1.63m/s on the Moon, the speed of light is apporx 300,000,000 m/s, people learn these numbers in middle school. It's not 1000 km/h, or 28,000 km/h, it just looks so weird.

Edit: ok, acceleration is meters per second per second, but my point stands.

I understand the appeal of using the same combinations everywhere, but I thought the great thing about the metric system was that it was easy to convert. So 8000 m/s is 8 km/s.

The problem is with the "hours" part. Which, not accidentally, is not even part of the SI.

They are likely appealing to the common population who mostly think of speed in mi/h or km/h due to car speeds

In the official BIPM brochure, hours are technically classified as "Non-SI units accepted for use with SI." This puts them in the same category as liters, hectares, tonnes, decibels, etc.

https://en.wikipedia.org/wiki/Non-SI_units_mentioned_in_the_...

I can read Wikipedia too. All the calculations are done in m, s, g, etc. if you want to dumb it down to the public you might as well go in miles per hour, leagues per day, etc., spaceflight is not the place where it is appropriate.

> if you want to dumb it down to the public you might as well go in miles per hour,

The blue origin launch this week used mph and feet of elevation, and I can definitively say that using modified SI is way way better than US customary

> spaceflight is not the place where it is appropriate.

But, a video stream meant for the public consumption is. SI are standardized for the context of calculations, not necessarily for human consumption, which happens to be why nobody gives the weather in degrees kelvin.