“In photography, the golden hour (sometimes known as magic hour, especially in cinematography) is a period shortly after sunrise or before sunset during which daylight is redder and softer compared to when the Sun is higher in the sky“ wikipedia
It’s the time when the lighting is best for photographers and we are able to capture some wonderful images; it is after all all about the light. As you can see from the first image, the photo was taken during the sunrise golden hour hence the golden glow on the building. Conversely there is something known as the blue hour which is when the sun has dipped below the horizon and the sunlight takes on a predominantly blue color. While the second shot of the same scene wasn’t quite during the blue hour, it was taken later in the afternoon/early evening which gave the scene more of a sky blue glow with just a hint of the sun as it was beginning to set.