"At that time the sign of the Son of Man will appear in the sky..."
The Scripture immediately preceding states:
"the sun will be darkened, and the moon will not give its light;" (Matthew 24:29)
If "at that time" refers to the time of the 'eclipses in 2015' it follows that "the sign of the Son of man will appear in the sky" soon after the '2015 eclipses'.
According to Your Word, come Lord Jesus!