“the sky is both a clock as well as a calendar” ~ Galileo

human life, a business & stock market - you know what drives all of them .. its the calendar or time ..!

now what is the logic or science behind a calendar ..?

a calendar, as used in Western World is nothing but a cross-section of cycles of two heavenly bodies (Sun & Earth; i use the word planet, but the Hindi word is Graha); anyway, the calendar is based on Earth's circular motion around her own axis (gives us day and night) & around Sun gives an Year, where the 4 Quadrants result in 4 seasons; and the Zodiac gives the monthly calendar; so far so good.

Indians, you may know, like to complicate things, so we added one more to the mix - The Moon - to make it a 3 planet calendar .. by introducing moon, which has two phases Krishna-Paksha and Shukla-Paksha, bounded by Amavasya and Poornima, we have a lunar month - which guides the oceans tides as well as the women's monthly cycles -- how romantic ..? also, The Moon in the mix gives us Eclipses - when the 3 get in alignment;called as Rahu & Ketu in Indian Astrology. It is because of The Moon or Lunar Calendar that Diwali is celebrated on different date each year; that you have to go an expert/Astrologer who knows how to study Panchang (Astrological Calendar) to find a date for Diwali and other Indian festivals each year.

here i will take an opportunity to digress a little & to connect a subject that is important to both Human Behavior and Market Behavior - Astrology ...!

So what's an Astrology ..?

it's not what most people think, which is based on what you get on Internet every day to how your day will be .. Vedic Astrology is simply a 10-planet calendar, & these 10 planets (9 Graha + Earth) based on cycles of Sun-Moon-Earth-Venus-Mercury-Mars-Jupiter-Saturn-Rahu-Ketu (the last two represent Solar and Lunar Eclipses)

now imagine, going from a 2-planet Calendar (like a 2-variable equation) to 3-planet Calendar (3-variables equation) makes you to go to an expert to know the date of an Indian festivals ... & now imagine life on a 10 planet Calendar (10-variables equation) to give you time at any moment; certainly will drive you crazy ... on top of that this 10-planet calendar is totally personal to you, as it begins on the date-time-location of your birth & that my friend is Astrology and not the mambo-jumbo that most have experienced.