The B.C.& Past A.D. Dates Are Not In Sync

Hi, this is Isaac again. The following post is a repost in response to the questions that I was given about the issues I raised regarding the dates in Sky Safari being out of sync. The reason I am reposting this is because I wasn't sure how to properly reply back, so I wasn't sure if my posts got read. Just in case it didn't I went ahead and reposted my response below. If any of you have already read my response posts, then you can ignore this post. But if any of you were unable to see my responses, please continue reading below: My Response: I'm using Android Samsung Galaxy S6, and I'm using SkySafari Pro, Version 6.7.8.1 Just to give you some examples of the issues I'm noticing: For the year 3967 B.C., it shows that October 4th fell on a Wednesday. This is incorrect. If you look at any B.C. calendar, October 4th, 3967 B.C. fell on a Saturday. For the year 3960 B.C., it shows that September 17th fell on a Saturday. That is incorrect. If you look at any B.C. calendar, you'll see that September 17th, 3960 B.C. fell on a Friday. When it comes to the lunar phases, for the year 30 AD, Sky Safari Pro 6 used to show that the New Moon in March began on March 22nd, which was accurate. But now it's showing the New Moon beginning on March 24th, which is two days off. Like I said, I don't know what has happened. All I know is that all of this started happening on January 16th of this year. Prior to that day, all the days of the week of the early AD period (all the dates before the modern era) and BC period fell on the accurate days of the week, and the lunar phases fell on the accurate days of the month. Since January 16th, everything went out of sync. All of the dates of the modern period and future period still look the same. But the past periods are all screwed up. Here are B.C. calendars that you can compare to Sky Safari Pro 6's BC calendar: 1. Rosetta Calendar https://www.rosettacalendar.com/ 2. Julian Day Civil Date Calculator https://core2.gsfc.nasa.gov/time/julian.html 3. Fourmilab's Calendar Converter https://www.fourmilab.ch/documents/calendar/ Check each of the above calendar sites and you will see that all of the dates of the B.C. period in Sky Safari Pro, Version 6.7.8.1 are out of sync (they do not fall on the accurate days of the week) Here are two prominent lunar phase sites: 1. Moon Calendar http://www.paulcarlisle.net/mooncalendar/ 2. Six Millennium Catalog of Phases of the Moon http://astropixels.com/ephemeris/phasescat/phasescat.html If you look at the early AD periods (all the dates before the modern era) and perhaps some of the BC periods on these Web sites, you will see that the dates of the lunar phases do not match the dates of the lunar phases of Sky Safari Pro, Version 6.7.8.1 For instance, according to both astronomical sites, the New Moon in March of 30 AD began on March 22nd. This is exactly what Sky Safari Pro Version 6.7.8.1 used to show on its program up until January 16th of this year. Now it shows the New Moon in March of 30 AD falling on March 24th, which is two days off.