Stay on Earth.
Pretend all is normal and fine.
Once the ‘elite’ have left to their new planet:
Cut off all communications with them.
Destroy any of their supply lines left behind.
Wait 5-10 years.
Watch as the Earth heals rapidly, with it’s biggest source of destruction now gone and nature resumes being an unstoppable force.
Live a long and happy life, free of megalomaniacs.
Optional: hold hands with two chicks at the same time.
i go to https://www.timeanddate.com/astronomy/night/ which is not really an app and it can be a bit wonky at times but it works better than every mobile app i’ve seen.
the desktop version of stellarium is the only worthwhile open source program i know about.