Antonio Tempesta [Public domain], via Wikimedia Commons
Niobe apparently bragged about all of the children she had, upsetting the other gods. To punish her, they killed all 14 of her children (that's about 13 too many children anyway). In astrology, it's supposed to show where you'll be humbled if you let yourself become too proud, boastful, arrogant. Basically, if you're a prick, you'll get kicked in the . . . shins?
On astro.com, Niobe is number 71. In my chart, I have Niobe in Aries and it falls right on my 6th house cusp (the cusp of a house is the very beginning of that house). So I need to make sure I don't brag about my awesomeness (that's so hard! uhhhh . . .), especially when it comes to my work. I shouldn't take too much pride in my work, or my work will blow up in my face.
In transit, Niobe can show areas where you may be humbled if you show excessive pride. Currently, Niobe is in Cancer and my 3rd house (so no bragging about my mental prowess), and sextile my Mars (or my physical prowess). To find where Niobe currently is located you can use astro.com (go to extended chart selection, then click on ephemeris, and type 71 in the additional asteroids and other objects section). What is your Niobe doing?
Mars Retrograde in Aquarius & Capricorn: June - August 2018
Mercury Retrograde in Leo: July - August 2018
July 2018 New & Full Moons
June 2018 New & Full Moons
Jupiter in Scorpio: October 2017 - November 2018
Saturn in Capricorn: December 2017 - March 2020, July - December 2020
Uranus in Taurus: May - November 2018, March 2019 - July 2025, November 2025 - April 2026