Jyotisa was developed by the ancient sages for the primary purpose of determining the best timing of activities for maximum utilizing potential.
Electional astrology or "muhurta" what we know today serves that purpose. Choosing the best time for your big endeavors is very essential. Also avoiding certain inauspicious dates and times is probably even more important.
Just like eclipses "Rahu Kaalam" is one more such time in the day you want to avoid. You can view the Rahu Kaalam in the "panchang" calendars like mypanchang.com
