每日一图 (每日约13.30更新)

https://minemymy.com/public/images/g.jpg
If you went outside at the same time every day and took a picture that included the Sun, how would the Sun's position change? A visual answer to that question is an analemma, a composite image taken from the same spot at the same time over the course of a year. The featured analemma was composed from images taken every few days at noon near the village of Callanish in the Outer Hebrides in Scotland, UK. In the foreground are the Callanish Stones, a stone circle built around 2700 BC during humanity's Bronze Age. It is not known if the placement of the Callanish Stones has or had astronomical significance. The ultimate causes for the figure-8 shape of this and all analemmas are the tilt of the Earth axis and the ellipticity of the Earth's orbit around the Sun. At the solstices, the Sun will appear at the top or bottom of an analemma. The featured image was taken near the December solstice and so the Sun appears near the bottom. Equinoxes, however, correspond to analemma middle points -- not the intersection point. In two days there will be an equinox ("equal night"), when day and night are equal over all of planet Earth. Many cultures celebrate a change of season at an equinox. APOD's main NASA site is moving: From apod.nasa.gov to science.nasa.gov/apod

人类社会 VS 异域文明 什么是异域文明? 广播消息

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用户吴鹏 2023-06-07 18:22:40 说:

你好,幸会了!

生存问题虽然没有解决,但是决定全身心开始工作

From: 吴鹏 源于推荐阅读 2023-04-23 17:14:18

大奖,一直没有。

收入一直没有。但是,我知道,时间越少越少,

危机越来越多。

我必须开始全身心投入工作了。

必须完成我的使命和责任。

首先需要构思大概内容。书写出来。

在新网站上。

然后,每天写一些思想,充实内容。

数学逻辑学物理学,很多地方不明确,

但是,没法细致研究了,必须完成我的工作。

那就把想法写出来吧。

提纲,细节。未来伏笔。过去埋笔。

都要用文字体现出来。开始吧。阿们。