Yes, there is a bug.
On the day in question, you had gained 200 points, but had one answer with a downvote (net rep: 198). The kicker is that you responsibly deleted this answer, which refunded the -2 from the downvote; however, the badge logic doesn't take this refund into account.
It was a known edge case, because a truly thorough check of why a user ...
Concern? Even the FAQ does not tell this, but SO is actually a browser-game for techies and nerds.
That's also why the whole Winter-Bash is so tremendously popular. It's like an long-awaited skin or decoration feature in a MMORPG.
So what should one be concerned about? That it motivates users to use the site? Maybe it's just what we need: To not take ...
The /reputation audit trail shows you totals per day minus deleted posts.
The count towards the Epic and Legendary badges counts days that you reached 200 points without removing deleted posts, I believe.
So if you reached 200+ points on a given day but later a question you answered is removed and losing the rep gained from your answer puts you below 200 ...
About a month two weeks after joining SO I was serially upvoted twice in a matter of four days (Mar 1 & Mar 4), though I didn't earn the Mortarboard Badge. This actually was REALLY annoying. Being new I initially thought it was awesome then it was reversed and happened again three days later and not knowing the cause I did actually think I might "get in ...
It was too much work to not post it but @Glorfindel beat me by a few minutes.
Here is the query:
(do note this looks at both regular sites AND site meta's. The latter might feel strange because site meta's don't show rep but you still earn the reputation related badges)
-- result table, don't rename and keep the site column
create table #results ( site ...
According to this SEDE query, the Illuminator badge is (much) rarer than Legendary on most sites; of course, there are exceptions, but there's just a handful of them. You can edit the query parameters to compare other badges.
According to this SEDE query, no user on Stack Exchange has more than two legendary badges. That is surprisingly low, but obtaining the badge requires a lot of dedication.
Those users are (at the moment of writing this):
Stack Overflow & Meta Stack Exchange
Nick Craver (1 and 2)
Bill the Lizard (1 and 2)
Oded (1 and 2)
Pekka supports GoFundMonica (1 ...
It is not the rarest badge on every site.
Over on Arqade, it has been awarded once, whereas Tenacious and Unsung Hero have never been awarded. There are similar situations with those badges, or Reversal, on other sites as well. Electrical Engineering was mentioned in the comments, and I also spotted it on ELU.
Congrats! You are one of 350 who got the badge retroactively as result of this fix by Jarrod.
To sum it up:
To fix this, we have decided to ignore all rep changes due to downvotes - whether you cast or receive them, they will no longer deduct from your daily total towards Mortarboard, Epic, and Legendary.
On Feb 6th you got more than 200 rep due to ...
The badge is awarded only once per user, not multiple times. All badges that aren't explicitly stated as being awarded multiple times are only awarded once.
As rene said, you already earned the badge on January 11. As such, you can't earn it again even if you meet the criteria again.
As time goes by, the above answer is no longer 100% correct. Specifically,
Reputation earned from these activities (accepting/accepted/bounty) before reaching the cap does still count towards the cap.
Has been changed. What's in effect now is
Reputation earned from these activities before reaching the cap no longer counts towards the cap.
Here's Jeff ...
The moment you've earned at least 200 reputation from anything (excluding the association bonus) then that day counts towards the badge - the reputation cap has absolutely nothing to do with the badge. Downvotes do not count against you for a day; the badge script ignores all negative events for the day when determining your eligibility. The badge progress ...
It's in the mail!...after the next build that is. There are a few changes I'm unsure about that aren't mine so not pushing production this morning.
The only badge that was changed to use the new reputation log was Mortarboard, I've just pushed updates to Epic and Legendary as well. These badges will be a bit more lenient than previous because of how we ...
I just looked over your rep graph and saw only 49 days on which you earned 200 or more reputation from vote-type sources. You're one short.
On March 25, you went over 200 only because of the account association bonus, which isn't a vote and therefore doesn't count for the badge. On April 24, you hit exactly 200, but eight points came from suggested edits to ...
The progress bar for the Mortarboard badge counts to 1 because that is consistent with how the progress bar counts for its relatives: Epic and Legendary. Those require you to hit 200 reputation on 50 and 150 days, respectively. It doesn't make much sense to have the bronze badge do something different from the silver and gold badges.
As an aside, you can ...
Before starting to write this post I agreed with you, as I noticed this around ios related tags yesterday. It seemed that common knowledge questions were being up voted through the roof. Well, I just looked through the posts in this tag from the last 48 hours or so and I've come to realize that the problem isn't anywhere near as severe as I thought it was ...
Although reputation on meta is taken from the main site, the badge mechanics, including the badges based on reputation, still works, giving you badges based on reputation you weren't aware off.
The following query shows the number of days a certain member of Meta Stack Overflow has hit the rep cap making you eligible for the Mortarboard badge. If this ...
As indicated by the FAQ, only unupvotes and unaccepts affect the day they occurred. Because downvotes are not considered in any way for those badges, undownvotes are also ignored for it.
Calculating all the events for that day minus the downvote and undownvoted events, that day calculates out to 199 for you.
The badge award is something you see, and since it's the first time you have crossed that reputation threshold, it's also likely that it's the first time you'll see votes without any value (since you hit the cap). The link serves to educate people about the reputation cap that they are seeing kick in for the first time.
I updated the Mortarboard query to use our newer RepHistory table, which is a more efficient and correct* way to find matching users. However, I didn't filter that particular bounty cancelled event from the criteria.
This has been fixed and the erroneous badges removed from all sites.
* previous calculation did not factor in the 2 rep awarded for ...
As per Oded's answer: (emphasis mine)
status-bydesign - These are sorted by the combined
completion %ages of both bars (I don't think there is a reasonable
secondary sort to this), given that both parts are required in order
for the badge to be earned. In that respect the three highlighted
badges are all 5% completed (2/20 == 10% - the other bar ...
I've modified this SEDE query to show the sites where users obtained their badges.
Rand al'Thor earned his badges on Science Fiction & Fantasy and Puzzling Stack Exchange. I think he qualifies.
Another candidate (depending on if you consider TeX to be programming or just 'markup') would be egreg who is legendary on Mathematics and TeX - LaTeX.