Today is the day – the Day of Atonement, Yom Kippur, begins on September 18 .
During this holy day, Jews will fast, pray and visit their synagogue, with a focus on sins – whether national or personal – and repent for their acts against God’s teachings.
Traditions involve fasting, not wearing perfume, not having sex and taking part in prayer.
Traditionally the most celebrated day for those practising in Judaisim , the celebration begins at sundown and lasts for 25 hours, but when is the official time to start?
What time does Yom Kippur start?
The time to start Yom Kippur depends entirely on where you are in the UK, as it is reliant on sundown, meaning this will be between 6.45pm and 7.08pm on Tuesday, September 18.
During this time Jews will fast, abstaining from everything including water.
There are some exemptions.
Young children, those with a medical condition, or pregnant women do not have to fast during the celebration.
What time does Yom Kippur end?
25 hours after sundown, falling after sundown on the following day, which on Wednesday, September 19 will be about 7.73pm
What is Yom Kippur?
Yom Kippur is the end of the Ten Days of Repentance – when Jewish people reflect on their sins over the past year.
It marks a period of fasting – that’s from eating or drinking, bathing, anointing the body with oil, wearing leather shoes or having sexual relations.
The night before Yom Kippur families gather for a meal, lighting candles, saying a blessing and going to synagogue for a service called Kol Nidre.
No work is done on the day either, and five prayer services are held.
The final one is called Neilah, when God’s judgement on what the next year will bring is final.
There’s also a meal to break fast and a song and dance.
It’s a sombre holiday so people don’t say Happy Yom Kippur but you can wish people an “easy fast” or a list of other greetings.