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Islamic holidays

Wikipedia's first sentence called it “different from the solar-based gregorian calendar”. Today it says “based upon the cycle of the moon”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2025 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2025

Holidays in Islam Eid celebration in Sholakia , Bangladesh . The largest Eid congregation . There are two main holidays in Islam that are celebrated by Muslims worldwide: Eid al-Fitr and Eid al-Adha . The timing of both holidays are set by the lunar Islamic calendar , which is based upon the cycle of the moon, and so is different from the more common, European, solar-based Gregorian calendar . Every year, the Gregorian dates of the Islamic holidays change. Both Eid al-Fitr and Eid al-Adha follow a period of 10 holy days or nights: the last 10 nights of Ramadan for Eid al-Fitr, and the first 10 days of Dhu al-Hijjah for Eid al-Adha. The Night of Power (Arabic: لیلة القدر, romanized : Laylat al-Qadr), one of the last 10 nights of Ramadan, is the holiest night of the year. Conversely, the Day of Arafah , the day before Eid al-Adha, is the holiest day of the Islamic year. There are a number of other days of note as well as festivals, some common to all Muslims, others specific to Shia Islam or branches thereof. Additionally, Friday is considered the holiest day of the week, and, in Islamic tradition, is considered a celebration in itself. Friday prayers (Juma) are congregational prayers held in mosques , and Muslims are encouraged to wear clean and refined clothes, perfume, and bathe. It is customary to eat special meals with family on this day.

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 1294544760.
Today
Wikipedia's first sentence called it “different from the solar-based gregorian calendar”. Today it says “based upon the cycle of the moon”. Read the current article and compare.
201020152020Oct '232025
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What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since October 7, and today's defining sentence is their current revision.

Then

different from the solar-based gregorian calendar

Now

based upon the cycle of the moon

Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

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