Hanuman Jayanti is special for hindu devotees. Lot hanuman devotees worship the god and they chant the hanuman Chalisa and hanuman dandakam. Every time the hanuman birthday comes on chaitram shloka Poornima. So, on that day, who worships the god, their desires solved by the hanuman god.
Shani deva has tried to attract the hanuman but hanuman getting angry on that situation. hanuman was held him in a reversely head top. Shani deva asked for hanuman for forgiving. God hanuman ordered to Shani deva for solving the problems, who worships the god hanuman. They leave from the 7 ½ years Shani errors.