Previewing 2017's Biggest Skywatching Events Using Mobile Astronomy Apps — Part 2

In this second part of our 2017 preview, we'll cover how you can use mobile apps to spot elusive Mercury, see the motions of Jupiter's largest moons and the planet's Great Red Spot, and track the Planetary Society's shiny solar sailing spacecraft, called LightSail 2, when it launches later this year. 2017 brings two excellent opportunities to spot the elusive planet Mercury, even with the naked eye, and you can preview the events and plan your observations using astronomy apps. As the innermost