I would like to create a specific shortcut which sends me a reminder one hour 38 minutes before sunrise and another reminder 25 minutes before sunrise . The timing is very specific and is related to sunrise. I cannot find any option where I can specify. How many hours and minutes before sunrise. Should I get a reminder I would like to create an automation to do so
What about creating an automation which runs once per day and sets time-based reminders in the Reminders app for those two times?
The get details of weather condition action in Shortcuts can get you those times and you can calculate the desired offset for each.
One limitation is you could vary your location from where you get the sun rise/set stime for. So keep that in mind if you travel any notable distance in between.