Time of birth questionable. That does not affect the sign positions of the planets. A five planet majority in Mutable signs (communications). Only one in a Fixed sign: Mars in Taurus. Most of his emphasis was on simplifying life and had to do with the trivia of day-to-day living. The one Fixed sign planet drew his attention to longer range matters and he turned “Simplify, simplify, simplify” into a crusade. A five planet majority in Water signs as well. This made his horoscope strong in both Mutable and Water. The Mutable Water sign is Pisces so we would expect traits of that sign to show up strongly in his life (“Let’s run off to Walden Pond and get away from the world.”). Mars was also Thoreau’s only planet in an Earth sign. Venus was his only Air sign placement. They have one thing in common. They both rule the small matters of day-to-day living.