By the time you finish reading this story, you'll be about 1,000 kilometers closer to the planet Mars.
Earth and Mars are converging for a close encounter. The distance between the two planets is shrinking by about 300 kilometers every minute.
When the convergence ends in mid-April, the gulf between Earth and Mars will have narrowed to only 92 million kilometers – a small number on the vast scale of the solar system.
Astronomers call this event an “opposition of Mars” because Mars and the Sun are on opposite sides of the sky. Mars rises in the east at sunset, and soars almost overhead at midnight, shining burnt-orange almost 10 times brighter than a 1st magnitude star.
Oppositions of Mars happen every 26 months. Of a similar encounter in the 19th century, astronomer Percival Lowell wrote that “[Mars] blazes forth against the dark background of space with a splendor that outshines Sirius and rivals the giant Jupiter himself.”
In other words, it's really easy to see.
There are two dates of special significance.
April 8 is the date of opposition, when Mars, Earth, and the sun are arranged in a nearly-straight line.
If the orbits of Mars and Earth were perfectly circular, April 8 would also be the date of closest approach.
However, planetary orbits are elliptical – that is, slightly egg-shaped – so the actual date of closest approach doesn't come until almost a week later.
On April 14, Earth and Mars are at their minimum distance: 92 million kilometers, a 6-plus month flight for NASA's speediest rockets.
You won't have any trouble finding Mars on this night. The full Moon will be gliding by the Red Planet in the constellation Virgo, providing a can't-miss “landmark” in the midnight sky.
Remarkably, on the same night that Mars is closest to Earth, there will be a total lunar eclipse. The full moon of April 14-15 will turn as red as the Red Planet itself. See this video for details: http://youtu.be/5gzgSuJM5O8 .
Although these dates are special, any clear night in April is a good time to look at Mars. It will be easy to see with the unaided eye even from brightly-lit cities.
With a modest backyard telescope, you can view the rusty disk of Mars as well as the planet's evaporating north polar cap, which has been tipped toward the sun since Martian summer began in February.
Experienced astro-photographers using state-of-the-art digital cameras can tease out even more – for example, dust storms, orographic clouds over Martian volcanoes, and icy fogs in the great Hellas impact basin. The view has been described by some observers as “Hubblesque.”
Dr. Tony Phillips works for the National Aeronautics and Space Administration.