People long doubly for loved ones at festivals - the Mid-Autumn moon shines especially bright.
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history
A Ming-Qing era proverb, widely popularized through 增广贤文 and Feng Menglong's 警世通言: 月到中秋分外明,每逢佳节倍思亲. (The moon at Mid-Autumn is extra bright; at every festival, longing for kin is doubled.) The second half echoes Wang Wei's Tang couplet 独在异乡为异客,每逢佳节倍思亲.
usage
分外 is read with 4th tone fèn (not fēn), meaning 'extraordinarily / especially.' Often cited together with 每逢佳节倍思亲 around Mid-Autumn Festival greetings.