एकादशी

Oldest vaidik fast. Humans are formed in the fashion of भगवान् विष्णु, who's in योग निद्रा.. five senses of perception, five  of action, eleventh is the subconscious mind.. as the शक्ति she's thus named एकादशी.. It's the worship of भगवान् विष्णु's मानस। 

There are 24 एकादशी every year signifying the 24 अवतार of भगवान् विष्णु। 

Also, one human year equals one दैवीय day, 24 एकादशी ie 24 hours. When the देवता sleep देवशयन एकादशी happens and चतुर्मास् begins, this year on 29 June..when देवता awaken it's देवोत्थान एकादशी, this year on 23 Nov. The rainy season on 🌎is the night for the Gods. देवी माँ लक्ष्मी wakes up 45 देव minutes ie eleven human days before स्वामी विष्णु, that day on अमावस्या is दीपावली for us humans. 

N.B. - देव उत्थान एकादशी is the ब्राह्म मुहूर्त of देव लोक and their sunrise is the first पूर्णिमा in कार्तिक मास on 🌎after दीपावली which we celebrate as देव दीपावली 🙏

It's beyond the limitations of the physical realm/sciences we know.  

According to capacity people can do एकादशी  fast - 

१- No rice, 

२- no grains/cereals only fruits, 

३- no grains/cereals, no fruits, no water. 

The final one is nirjala, पांडव भीम was the first one to do it in ज्येष्ठ , that's why it's called भीमसैनी एकादशी too. 

Some ppl who themselves keep निर्जला might want to do something more on जेठ एकादशी so they might put up water/शरबत for the passersby in the summer. 

Last meal with water is on दशमी night, fast is broken with द्वादशी sunrise. 

Ideally every एकादशी व्रत  should be निर्जला but जेठ one is the hardest so it's considered the most austere. 

I tried to summarise as much as possible 🙏 

P. S. - This year चतुर्मास is of 4+1 मास as one अधिक मास is added per rule this year to average out the lunisolar calendar. 

So it's the श्रावण मास specifically which shall be repeated. It'd be of two months in 2023 english year.