Firmamentum is a planetarium software for phones and tablets.
It is designed especially for use with binoculars and telescopes, naked eyes too (for quick exploration of the sky).

Features:
- zoomable from 0.5x to 512x
- 275,000 stars up to 10th magnitude
- 4400 deep sky objects (galaxies, nebulae and other) up to 13th magnitude
- more than 500 pictures of nebulae
- all variable stars brighter than 9 magnitudo with amplitude exceeding 0.5 magnitudo
- all double stars brighter than 9 magnitudo with separation exceeding 1 "
- accurate positions of the Sun, Moon and planets
- moons of Jupiter and Saturn
- all asteroids brighter than 9th magnitude
- all comets brighter than 9th magnitude
- easily set date of observation between 1500 and 2500 year
- long press to reveal object's details
- times of rising, transiting and setting of all objects
- night (red) mode with brightness adjustment
- atlas mode (like paper one)
- catalog of all objects (click & point to) with search functionality
- GPS positioning, manually either (remember to set up it first)