The Sun Sigil can be one of the more frustrating items to get in the game, since it is tied to one of the mini-games. Head to the Calm Lands and speak with the Chocobo-riding lady there. If you haven’t done it yet, you might have to do some training with the Chocobo, which aren’t very difficult at all. Eventually, though, you’ll get the option to race and that is where the Sun Sigil will come into play. The race involves you dodging birds, while collecting balloons. For every balloon you collect, your time will decrease by three seconds, while getting hit by a bird will increase your time by three seconds.
The goal of the race is to get your overall time under 0 seconds. That means you want to be in the negative and not exactly at 0 seconds, as that won’t count. Since the Chocobo will constantly move as you’re attempting to control it, this can be quite the frustrating mini-game and will probably take a lot of practice. There is also a lot of randomness involved, too, as the balloons are not in the same spot every single time, so you can’t plan ahead. Finishing in under 38 seconds, while hitting 13 balloons and no birds will get you the Sun Sigil.