1. Autumn scenery and atmosphere: In autumn season, the weather gets cold and the natural scenery becomes more colorful. You can write some scenery descriptions about autumn, such as leaves turning yellow, maple leaves turning red, the sky becoming clearer, etc., to create a unique autumn atmosphere.

2. Autumn festivals: There are many important festivals in autumn, such as Mid-Autumn Festival, National Day and Double Ninth Festival. You can write some introductions about the origin and traditional customs of these festivals, so that readers can better understand the significance and celebration methods of these festivals.

3. Autumn health: Autumn is a good season for health. You can write some knowledge about autumn health, such as how to eat, how to keep warm, how to exercise properly and so on. To help readers stay healthy better.

Characteristics of the autumnal equinox:

1. Diurnal isochron: At the autumnal equinox, the sun reaches 180 degrees. At this time, the time of day and night on the earth is almost equal, each being 12 hour. This feature makes the constellations in the night sky more and more clear after the autumnal equinox, because the night time is getting longer and longer.

2. The temperature difference between day and night increases: after the autumnal equinox, the time between day and night is almost equal, the daytime is longer, the sunshine is longer, and the night time is relatively shorter, so the temperature will drop obviously during this period, and the temperature difference between day and night will gradually increase. This temperature change will gradually increase, making the weather in autumn drier and drier.

3. Harvest season: The autumnal equinox is the harvest season. Autumn crops begin to mature and the earth begins to show a golden scene. Farmers are busy harvesting the fruits of their labor in this season, which is also one of the most important moments in autumn.

4. Changes in natural landscape: After the autumnal equinox, nature began to present a golden scene. This is because the leaves in autumn gradually change color, from green to yellow, orange and red. This color change is one of the signs of seasonal change and one of the most spectacular natural landscapes in autumn.