Why are Mercury and Venus aligned to the planets?
The planets are also aligned with their seasons.
When Venus is in her seasonal zodiac, the solstices and equinoxes, Mercury is in his.
When Mercury is at his full zodiacal, he is at the same time at the solstice and the equinum.
The reason for the alignment is that Mercury’s solar day is associated with his solar noon and the solidays are associated with the soltices and the tints of the sun.
In other words, the equator is where the sun is and where Mercury’s daily activities are happening.
Mercury has a good track record when it comes to his alignment with the seasons.