How come there are 2 different observations in 2 different lunar calendars for the same period of time?

I am sure there is pretty much one earth moon. I compared two different lunar calendars and the time varied from one to another like when the moon transits one constellation to another ?

Are they genuine, am I suppose to take the average or what?How come there are 2 different observations in 2 different lunar calendars for the same period of time?Although I agree with other answerers %26amp; their explanation regarding your question. To me it appears you are referring two different lunar calendars. Most Lunar calendars do publish data simultaneously with respect to references from important places globally. Widely available Lunar calendars or almanacs are specifically used to observe religious or temple ceremonies in Islam, Judaism and Hinduism. They do catch and publish accurate data from their experiences and connections from scientific communities these days anyways, but some lunar calendars don't calculate or add specific aberrations happening in Moon's orbit or path. Moon apart from it's routine motion is subject to gravitational perturbations from planets like Jupiter, Mars %26amp; Saturn. This causes precession in Moon's path and attaining that particular fixed frame of reference with regards to a constellation. Usually by experience, observers know that this variation can be up to a maximum of 7 minutes and adjust their specific ceremonial observations accordingly.How come there are 2 different observations in 2 different lunar calendars for the same period of time?
Were the two calendars prepared for two different locations on earth? If so, I can imagine two sources of the differences:



1. If one or the other calender is expressing times in its local time zone, the two calendars will use different numbers to express the same instant in time (for example: 7:00 PM in San Francisco is the same moment as 10:00 PM in New York).



2. Even if two (widely separated) people are observing the moon at the exact same instant, they will not see it in the exact same position against the constellations. This is due to an effect known as "parallax". So if you are in San Francisco talking on the phone to your friend in London, and both of you are looking at the moon at the same time, you may see that the moon is right next to some particular star, but your friend will say that it ISN'T; from her point of view, that star is fully two moon-diameters away from the moon. The shift may be as large as 2 degrees (4 moon diameters), depending on how far apart the two observers are. And considering that the moon moves at a rate of about 1 moon-diameter per hour through the stars, this means there could be up to 4 hours difference between the transit time as seen from one location compared to the other.How come there are 2 different observations in 2 different lunar calendars for the same period of time?The moon is close enough to the earth (relative to the stars and constellations), that because of parallax, the position of the moon against the background sky may be slightly different for two observers far apart on the earth, at the same instant.

That means, observer A, in Australia, sees the moon cross a spot slightly before observer B, in Brazil.How come there are 2 different observations in 2 different lunar calendars for the same period of time?
Which two lunar calendars are you referring to? It might be just how each each one starts off counting days.How come there are 2 different observations in 2 different lunar calendars for the same period of time?If you are talking about astrology then they are both false.