Saturn Retrogrades:
2018, April 17 to September 9 – 09 to 02 Capricorn
2019, April 30 to September 18 – 20 to 13 Capricorn
2020, May 10 to September 29 – 01 Aquarius to 25 Capricorn
I'm not talking about NASA's but from someone else's video. Not sure how the images were taken...