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milidrag
Guest
Wrong.
Misconception.
I’ve already explained why and will not bother to repeat it to someone who missed the point and rushed to repeat its misconceptions.
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Misconception.
I’ve already explained why and will not bother to repeat it to someone who missed the point and rushed to repeat its misconceptions.
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Evan
Guest
NASA uses the Gregorian Calendar for dates after 1582 Oct 15.Wrong.
Misconception.
I’ve already explained why and will not bother to repeat it to someone who missed the point and rushed to repeat its misconceptions.
See eclipse.gsfc.nasa.gov/SEhelp/calendar.html
In general, the Calendar used on space missions rarely extend for more than 100 years. So Julian or Gregorian are no matter. Since were talking days, not hours/minutes/seconds, accuracy of the calendar is irrelevant for space calculations.
With the advent of computers, it is so simple to compute dates in either calendar, it really does not matter for space missions (since there is no longer day or night, spring or fall). Only time that passes is some arbitrary measure.
No calendar can be more accurate until you determine what is to be measured. On Earth calendars have been traditionally used to measure the years. IE the revolution of the Earth about the Sun based on the Equinox or the Solstice. In this case the year is
365.2424 days: a vernal equinox year (rounded to four decimal places) for the epoch 2000.
365.2425 days: the average length of a year in the Gregorian calendar.
365.2500 days: the average length of a year in the Julian calendar.
It’s hard to be wrong until a standard for comparison is established. If the purpose is to determine the vernal equinox and the day of passover, then we still need to adjust a leap day every 10000 years or so, but the 2nd coming may relieve us of that problem.
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milidrag
Guest
Wrong.…
In general, the Calendar used on space missions rarely extend for more than 100 years. So Julian or Gregorian are no matter.
…
en.wikipedia.org/wiki/Julian_day
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Evan
Guest
Very interesting. I had never seen such a thing before.
Note it states on the page:
The Julian day system was introduced by astronomers to provide a single system of dates that could be used when working with different calendars and to unify different historical chronologies. Julian day and Julian date are not directly related to the Julian calendar, although it is possible to convert any date from one calendar to the other.
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milidrag
Guest
Good. Now you might start to actually read my previous messages. BTW, I have never claimed that the Julian day is directly related to Julian Calendar.Very interesting. I had never seen such a thing before.
Note it states on the page:
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Evan
Guest
So why did you reference me to the Julian day when you say it does not relate to the Julian Calendar?Wrong. This is a misconception.
Julian calendar is less flawed than Gregorian one.
Julian calendar measures absolute time, e.g. how much exactly passed from a specific point in time, such as Christ’s birth and resurrection. It is therefore used in space missions, satellites, etc .
Gregorian one measures what is the time exactly at a certain point on Earth. It is therefore useless in space missions.
Now, what does a time in a specific point on Earth have with God’s measurement of time?
The Julian day is used for space missions etc, but the Julian calendar is not.
You say ‘how much time has passed’ and give 2 dates. Such as if you wanted to compute time between Christ’s birth and resurrection. What does that have to do with the date we celebrate Christmas?
We celebrate this as a time related to a calendar date. Which calendar you use would determine when the date falls.
So my birthday is a point in time. But my celebration is sort of near the same time as where the earth was in it’s orbit around the sun. I could celebrate it any time. If I were a horse, my birthday would be Jan 1 (they are all considered a year older on Jan 1).
The Gregorian calendar is an attempt to put the Earth in the same place in orbit on the same date each year. The Julian calendar is close to this by not as accurate [if this is the purpose of a calendar].
In the Gregorian calendar, the vernal equinox is always within a day of March 21 (northern hemisphere).
The equinox slides 3 days in 400 years in the Julian Calendar.
The reform was made because the equinox is used to compute the start of passover, a nearby day for holy Thursday, and the celebration of Easter.
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Montalo
Guest
The Old Calendarists are a splinter group, not in communion with Orthodoxy.I’ve heard them called Old Calendarists I also think the ROC follows the Julian calendar but I could be wrong on that. But i don’t see why anyone would want to use the Julian calendar since it is after all flawed.
There are Churches, such as mine (the Russian and the Serbian Church) which use the Old Calendar(other churches do too, mainly the SLavic churches), but we are not Old Calendarists
I believe only the Church of Finland uses the Gregorian Calendar outright.Many Orthodox today use a Revised Julian Calendar which is essentially the Gregorian Calendar but the calculation for Easter still uses the old Julian Calendar. And others outright use the Gregorian Calendar.
Those who stick to the old Julian Calendar do so because that is how they, as a culture, celebrated Christmas since their respective cultures became Christian. Imagine if you have to change Christmas in the US to another date today (give any hypothetical reason), it is not easy.
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milidrag
Guest
BINGO!…
The Gregorian calendar is an attempt to put the Earth in the same place in orbit on the same date each year.
Exactly, and that is why it is flawed. See en.wikipedia.org/wiki/Nikolas_Kopernik
No, it is not.…
The Julian calendar is close to this by not as accurate [if this is the purpose of a calendar].
While Gregorian Calendar is purely Geo-centric, Julian isn’t. It is partly lunar, since it takes into account the shape of the Moon (sorry, can’t find the proper word in English for the shapes of the Moon now).
There lies the misconception. If the Earth was the center of Universe, and if the Sun and the Moon were always rotating around the Earth at the same speed and distance, Gregorian Calendar would be accurate.
But we know the Earth is neither the center of Universe, nor even of our Galaxy. As you might have heard, the outer space is widening, it is not a constant. So does our Galaxy and the distances between the Sun, Earth and Moon. Therefore, Julian calendar is accurate at any point in Galaxy outside the Earth where it can relate itself to the Sun and Moon. Julian time and Julian day are more precise - they are not the same as Julian Calendar, but they just follow its logic, of course, enhanced by scientific discoveries occurred meanwhile.
I hope I was clear enough.
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Evan
Guest
I don’t see how Copernicus’ bio is related to this discussion.
Perhaps you are looking for phase of the moon?No, it is not.
While Gregorian Calendar is purely Geo-centric, Julian isn’t. It is partly lunar, since it takes into account the shape of the Moon (sorry, can’t find the proper word in English for the shapes of the Moon now).
I think the disconnect in our discussion isThere lies the misconception. If the Earth was the center of Universe, and if the Sun and the Moon were always rotating around the Earth at the same speed and distance, Gregorian Calendar would be accurate.
But we know the Earth is neither the center of Universe, nor even of our Galaxy. As you might have heard, the outer space is widening, it is not a constant. So does our Galaxy and the distances between the Sun, Earth and Moon. Therefore, Julian calendar is accurate at any point in Galaxy outside the Earth where it can relate itself to the Sun and Moon. Julian time and Julian day are more precise - they are not the same as Julian Calendar, but they just follow its logic, of course, enhanced by scientific discoveries occurred meanwhile.
I hope I was clear enough.
What is the purpose of a calendar?
I’m not sure we see the same thing as the purpose. Are you trying to make each day within each year the same position of the earth relative to when the fixed stars are in the same position [sidereal year]
365.2500 days: the average length of a year in the Julian calendar.
365.2564 days: a sidereal year.
where I am trying to match a vernal year [fixed seasons… vernal equinox]
365.2425 days: the average length of a year in the Gregorian calendar.
365.2424 days: a vernal equinox year.
Is that where we are missing each other?
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ConstantineTG
Guest
The Greek Orthodox in the Philippines might too. I’ll have to double check. Doesn’t the OCA use Gregorian?I believe only the Church of Finland uses the Gregorian Calendar outright.
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Cavaradossi
Guest
Nope, they usually use revised Julian.The Greek Orthodox in the Philippines might too. I’ll have to double check. Doesn’t the OCA use Gregorian?
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