How to introduce the yellow calendar?

When people are talking about something out of date, they often blurt out, "That's an old yellow calendar, it's useless!" " So do you know what the "yellow calendar" is? That's easy to say. In fact, the "yellow calendar" is a popular calendar in the old society. Because it is often printed on yellow paper, it is named "yellow calendar". In addition to the calendar and 24 solar terms that people need, the "Yellow Calendar" is also full of superstitious dross such as "good fortune and bad fortune" and "the underworld of the ecliptic", which we should completely get rid of with a scientific attitude.