A rare optical phenomenon may occur shortly after sunset or before sunrise, known as a green flash.

Phenomena of atmospheric optics related to atmospheric ducting include the green flash, Fata Morgana, superior mirage, mock mirage of astronomical objects and the Novaya Zemlya effect.

The development of a green flash

The stages of a green flash

A mock-mirage green flash observed in San Francisco, California

A green flash also may be observed in association with the Moon and bright planets at the horizon, including Venus and Jupiter.

A green flash is more likely to be seen in clear air, when more of the light from the setting sun reaches the observer without being scattered.

One might expect to see a blue flash, but the blue is preferentially scattered out of the line of sight, and remaining light ends up looking green.

With slight magnification a green rim on the top of the solar disk may be seen on most clear-day sunsets, although the flash or ray effects require a stronger layering of the atmosphere and a mirage, which serves to magnify the green from a fraction of a second to a couple of seconds.

The " green flash " description relates to a group of optical phenomena, some of which are listed below:

The second inset frame is the Farallon Islands with a green flash on the left-hand side.

Sometimes just before sunrise or after sunset a green flash can be seen.

A green flash also may be observed in association with the Moon and bright planets at the horizon, including Venus and Jupiter.

Immediately afterwards a similar flash of intense green light was emitted from the tower of Minas Morgul as its garrison, led by the Witch-king of Angmar, marched out to lay siege to Minas Tirith.

Lotus Cortina models were solely offered as two-door saloons all in white with a contrasting green side flash down each flank.

Certain squares on the green flash, which if rolled over at any time ( not just while flashing ) will teleport the ball back to the start of the green.

These glasses are turned when there is a division ; one of the four-minute glasses is turned and the bells will ring and the clocks will flash green for the House of Representatives or red for the Senate for four minutes.

They have a focal plane of and provide a white flash every 7. 5 seconds, plus a directional light ( white, red, or green depending on direction ) at a focal plane of.

The police claimed that three men from Andinho's gang, driving a silver Vectra, had attempted to stop a green Vectra shortly before Toninho's murder, intending to carry out a flash kidnapping.

In states with bicameral parliaments, and in the federal Parliament, red and green lights near the division bells flash to indicate which house is being called.

He is also remembered for his work in astronomy, publishing both scientific and poplar articles on subjects from predicting eclipses to the green flash.

The metal strip they had taken off from was coal black against the green jungle around it.

Now, the next morning, they were anchored at The Elbow and the boat was riding directly over the underwater ledge where the green water turned to deepest blue and the cliff dropped straight down 600 fathoms, with the weighted line beside it ; ;

She munched little ginger cakes called mulatto's belly and kept her green, somewhat hypnotic eyes fixed on a light-colored male who was prancing wildly with a 5-foot king snake wrapped around his bronze neck.

His tweed suit was a baggy gray and green.

The large jar was brushed with Creek-Turn green toner and sponged off.

Inside of pieces was glazed with three coats of Creek-Turn bottle green antique glaze.

This specific fluorescence was readily distinguished from the light green nonspecific fluorescence in consecutive sections stained with 1: 10 dilution of NS and Af or with Af alone.

After these treatments the conjugate did not stain healthy or crown gall sweet clover tissues or stained them a very faint green which was easily distinguishable from the bright yellow-green specific staining.

In the indirect method, this was evident from the fact that tumor sections were stained light green even when stained with NS and Af or with Af only.

It was possible to maintain aerobic conditions in the pond by regular additions of sodium nitrate until the temperature decreased and the algae population changed from blue-green to green algae.

A trim green and silver-painted craft only 22-1/2 feet long, the Waco was entered to compete in the `` On-to-Spokane '' Air Derby of 1927.

The blonde's nude body was in bed, a green sheet and a pink blanket covered her.

Governor Wentworth contributed an ox for a barbecue on the green beneath the three-hundred-foot pines, and a barrel of rum was broached.

It was dark inside the room but enough light spilled from the restaurant behind her to enable her to make out a round table with a green cloth top.

At one point late in the day, when Palmer was lining up a 25-foot putt on the 16th, a thunderous cheer from the direction of the 18th green unmistakably announced that Player had birdied the final hole.

At the 4th tee Palmer chose to hit a one-iron when a three-wood was the proper club, so he put the ball in a bunker in front of the green.

He ogled a long redhead with green eyes, but she was a shill with her money in front of her.

`` Hurry up, we're late '', he said, noticing with a chill how gray the sky was this morning, the fog like a rope along the horizon, the choppy waves sending off sheets of blue and Kool-Aid green.

It was still raining, and Mrs. Kirby's cottages bloomed through the gray haze like the names they bore, vivid blue and green and magenta.

The sensation he so overwhelmingly realized was one which told him he had been there before but he knew he had not, and could not recall any place he had visited to be likened to the limpid green water or the little fountain-falls or the green demon imprisoned beyond his reach.

A number of species have come to be considered invasive, including, most notably in North America, dandelion, which was originally introduced by European settlers who used the young leaves as a salad green.

It consisted of green fields, valleys and mountains, everyone there was peaceful and contented, and the Sun always shone there.

It was capable of basic graphics, and could display onto either a television set, a colour ( RGB ) monitor or a " green screen " monitor.

After the November 2000 G8 protest in Montreal, at which many protesters were beaten, trampled, and arrested in what was intended to be a festive protest, the tactic of dividing protests into " green " ( permitted ), " yellow " ( not officially permitted but with little confrontation and low risk of arrest ), and " red " ( involving direct confrontation ) zones was introduced.