As per the Hindu beliefs, doing anything in shubh muhuratha and auspicious nakshatras always bring good results to the doer. Referring an astrologer or Hindu panchang is almost mandatory if you wish not to get stuck in an unsuitable piece of land. However, if you have already paid the token amount to the builder or so then also you may consider the auspicious date for registering your property as it is only through registration that you become the owner of the property.