What is the exact moment of the new year's arrival, when families gather around the Haft-Sin, called in Persian?

• A Sal tahvil ✓
• B Sizdah Bedar
• C Ghashogh-zani
• D Shab-e Yalda

Sal tahvil, 'the turning of the year', is the precise instant of the spring equinox announced on radio and television countdowns.