halil
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I have Steinbach's book and she applies planets to some of the cards. She uses Mercury for the rider and the letter.
so how do you feel the letter works with mercury in an astrological sense?
I think that's a great way to describe the difference. The rider is so often someone coming into your life, and that hits on mercury completely. Whether it's a person or a message, it's something come to you. It's all about movement, which is a large part of mercury, especially when you look at how mercury retrogrades affect everything from communication to travel.
The letter is more documents and written materials. It can be a message received, but it could also be signing a loan agreement for a new house. It's much more narrow than the rider. Gemini can be pretty indecisive and up in the air (my mother's a gemini and drives me nuts sometimes), and I'm not sure how indecisive the letter is. Maybe the 3rd house is more applicable.
I think aries is more stubborn, while the rider is fickle and flighty.
Does aries cover communication or news? To the best of my knowledge, I can't recall that it does. However, you're far more the expert.
I can type post Steinbach's astrology correspondence for the cards.