Measuring time by the Sun, the Moon and the Stars. As the sun moves across the sky, shadows change in direction and length, so a simple sundial can measure the length of a day. It was quickly noticed that the length of the day varies at different times of the year.
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That way, even if they accidentally connect to unsafe WiFi hotspots, their data will always be encrypted and safe from cybercriminals. WiFi hotspots are everywhere, and are increasing in number every day, but you can keep yourself safe at all times by using a VPN, just as AT&T and so many others wisely recommend.Remember, hackers canât steal what hackers canât see! Get Private Wifi Protect your personal information.hat way, even if they accidentally connect to unsafe WiFi hotspots, their data will always be encrypted and safe from cybercriminals. WiFi hotspots are everywhere, and are increasing in number every day, but you can keep yourself safe at all times by using a VPN, just as AT&T and so many others wisely recommend.