Hi Sinead,
if you want to read more about timekeeping on Mars, see this article from 2021.
I hadn’t realised that the calendar started in April 1955, but I do know that I am still in my 20s if I count my age in Mars Years.
At the start of each Mars mission the science teams tries to keep on Mars time – so they come to work 40 minutes later each day. See this article about it.
https://science.nasa.gov/resource/living-on-mars-time/
https://www.space.com/perseverance-rover-mission-on-mars-time
Teddy’s raincoat can be a great prompt for inquiry learning, particularly if you have a range of materials for the children to use to make the raincoat. I find that cultivating a slightly befuddled air is good – and resist the urge to tell the children which is waterproof or not. Claim that you used different materials last time your class did this and you don’t know which of these are waterproof…