Monday October 23rd two of the outer planets, Mars and Neptune, will be at heliocentric opposition, that is on opposite sides of the Sun. On that day the two planets will be separated by 180o. Mars will have a heliocentric longitude of 163o while Neptune will be at a heliocentric longitude of 343o. (343o – 163o = 180o)
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.