Even if one does not have natal planets in retrograde, one can still experience them during their retrograde transit. They can temporarily block the elements and create problems in the subconscious if we are not aware of them. The two most difficult retrogrades are Mercury and Saturn. Mercury as it happens so often and Saturn as it can transit over one point of the chart again and again; and create lots of problems. It is important to know retrogression of planets in a given year. The retrograde motion of one's dasha ruler can change the direction of events. Retrogrades indicate a concentration of energy in the part of the zodiac where they are active. If one has planets in that area then they will have major impact which could be both positive or negative depending on the overall chart status. Retrogrades make life appear to be stuck either for good or bad, or sometimes neither moving forward or backward.
Saturn and Jupiter retrograde once a year.
Mars and Venus once every two years.
Mercury retrogrades at least three times a year.
While analysing the transit effect of the retrograde planets remember the following:
One should be aware of Mercury retrograde. They are stress points in the year. Mercury retrograde creates communication problems and makes life uncomfortable. Stress, arguments, delayed journeys - all can make life troublesome during the Mercury retrograde. So do problems with computers, Internet, and other technologies. Double check all appointments, travel programme and journeys- remember not to stop your life. Decisions made during Mercury retrograde can be changed after it goes direct. Stress levels can climb sky high. Arguments can result from crossed wires. Mercury retrogrades at least 3 times a year so its awareness has a huge say in the quality of one's life. Gemini and Virgo need to be doubly conscious, it will make their life a lot easier.If a natal planet is on the same degree as Saturn stations, then we should expect that to be a major issue to contend with. This becomes even more important during difficult Saturn transits like Sade Sati, which is itself a troublesome transit(Exceptions are there for this as it could be positive for some). Saturn stationing over the exact degree of the Moon will bring untold mental stress. The house rulership and placement of the Moon will show where the problem is about. Also Saturn can transit over the same point three times, which concentrates the energy of its difficult influence.
The stationary points of Jupiter can positively enhance good qualities. It can make people think in wrong ways. Or encourage the possibility of getting wrong advice. Traditionally in India, marriage, auspicious events and new ventures are not planned when Jupiter is retrograde.
The stationary points of Mars. This can lead to war or aggressive tendencies. Mars retrograde can increase stubbornness and can herald a time for war. The impact on dasha, antar and prayantara dasha rulers. Past issues can become dominant. There can be a change in the direction of life. When your Lagna ruler retrogrades, it will have a major impact on your inner self. Venus retrograde indicates a focus on past relationships. Venus brings problems with relationships. It is not a good time to marry