CHICAGO - Every spring and fall, Chicago’s skyline transforms into the perfect frame for a celestial event known as ...

Chicagoans can get a glimpse of the sun perfectly aligning with Chicago's east-west streets during sunrise and sunset.

Equinoxes occur twice a year, in spring and fall, when Earth's axis is tilted neither toward nor away from the sun. As a ...

While Chicago got a blast of summer-like temperatures on Friday and well above-average temperatures Saturday, astronomical ...

While the season officially begins at 4:01 a.m., a clear look at Thursday's sunrise will likely be obscured by cloud cover as overnight rain and snow begins to dissipate from the region.

The best natural light show in Chicago isn’t a fireworks display or a concert laser show—it’s Chicagohenge. Twice a year, ...

A Chicago startup is making waves in the renewable-energy sector. A Chicago startup has raised $25 million in less than a year, with a goal of helping to ease and accelerate the country's grid ...

As Naperville considers the future of its electric grid, an array of energy procurement options was presented to a special meeting of the city’s Public Utilities Advisory Board Thursday night ...