The Shi'a argue that Iftaar (breaking of fasting) must be done when it is night. That the sign for knowing it is night, is the interlacing of stars.
Interestingly, their Imams say they seek refuge in Allah and disown anyone who breaks his fast when stars interlace with each others.
Tuesday, last day of Rabie' II, 368 h.
1- Reported to us the celebrity Muhaddith & Jurist Abu Ja'far Muhammad b. Ali b. al-Hussain b. Musa b. Babawaih al-Qummi, he said: Narrated to us my father, saying: Narrated to us Muhammad b. Yahya al-'Attar saying: Narrated to us Sahl b. Ziyad al-Adamy, from Haroon b. Muslim from Muhammad b. Abi Umair, from Ali b. Ismael saying: I was told by Abu Usamah al-Shah-haam saying: I heard Abu Abdullah [as] saying: Whoever delays Maghrib until stars interlace with each others for no good reason, I disown him before Allah.
Interesting isn't it?
PS. by respected brother al-Hajjaj