Matthew I. watched the sun go down over the Charles - and a heron - along the Esplanade the other day.

Copyright Matthew I. Posted in the Universal Hub pool on Flickr.

Saul Blumenthal captured the particularly vivid sunset over the Charles on Monday evening.

Copyright Saul Blumenthal. Posted in the Universal Hub pool on Flickr.

Sekbaavi watched the sun go down from the Hyatt Harborside Hotel.

Copyright Sekbaavi. Posted in the Universal Hub pool on Flickr.

Saul Blumenthal captured the setting sun setting railings afire over the Broad Canal in Cambridge.

Copyright Saul Blumenthal. Posted in the Universal Hub pool on Flickr.

Andy Watson watched the sun go down over Fresh Pond in Cambridge.

Posted under this Creative Commons license and in the Universal Hub pool on Flickr.

Sekbaavi watched the sun go down over Wollaston Beach on Sunday.

Copyright Sekbaavi. Posted in the Universal Hub Flickr pool.

Kalim Saliba was in the right place at the right time the other day to watch the sun go down under the Zakim Bridge.

Copyright Kalim Saliba.

At sunset today, the sky was suffused with orange. At the Lynn end of the Nahant Causeway, it was enough to give you a sense of what it would be like to be on Mars, if Mars were a bit warmer and had oceans and people and a causeway.

Sean Sullivan captured the orange sky near North Station.

Kalim Saliba braved the elements for this shot of the sun going down over the Charles.

Cool photo of the sun going down over the Longfellow Bridge and a flock of geese.