Dhanteras falls on the trayodashi of Krishan Paksha.Today is the day when we cherish the birth of Lord Dhanvantri an incarnation of Lord Vishnu. It is believed that on this auspicious day when the lords and the demons were churning the sea to attain amrit or the nectar, Lord Dhanvantri appeared with a jar of elixir( sweet medicine).
Lord Dhanvantri being the incarnation of Lord Vishnu announced that whosoever will pay reverence to me, will get the blessings of Maa Lakshmi.When the Lords and the Deamons prayed to Lord Dhanvantri, Maha Lakshmi appeared after a day i.e. on Amavasya during samudra manthan.
How to do Puja on this day:
To get saved from the wrath of Lord Yamraj for untimely death, today is the day when we start lighting an Akhand Diya or Jyot for these five days of festivals. After lighting the diya one needs to pray to Lord Yamraaj that he should protect us from untimely death.
Put lots of coins in your temple or place of worship and place a coin of silver or gold with Maa Lakshmi’s picture on top of it. After this one should Light a Diya of ghee and pay reverence to Lord Dhanvantari.Pray to the Lord that i request you to bless me with good health and wealth and also invite mahalakshmi to stay in your house and pray for prosperity and happiness of your family.