"Everything is connected through energy" - It's Key Principle of Vastu. Meaning of this line is Your Behaviour, Thoughts and feelings are stroungly influenced by your surroundings. Base of vastu is created with five elements called Panchtatwa. They are Space, Air, Fire, Water and Earth. All are connected with a particular direction which acknowledges the basic laws of nature By honoring these elements and their energies, we becomre more aligned with nature and therefore can achieve greater harmony in our everyday lives.
Astrology is an art of balancing enery with all the planets and their "Dasha".
Every Planet - including the shadow planet Rahu and Ketu have their own maha-dasha or phase that affects each person at different times.
It is only under the effect of positive planets that one can expect good things to continue for a long time, but the oposite is applicable if a negative planet starts its transit on you. Antradasha is just extended period of mahadasha.
Numerology is and art of balancing enery with lucky numers, lucky colors or with lucky planets
