The United States Naval Observatory began the A. 1 scale 13 September 1956, using an Atomichron commercial atomic clock, followed by the NBS-A scale at the National Bureau of Standards, Boulder, Colorado.

The Rockies trailed the Los Angeles Dodgers, the Arizona Diamondbacks and the San Diego Padres for most of 2007 Major League Baseball season – however – by August, Colorado showed a steady series of wins, while the Division-leading Dodgers began to struggle.

The Colorado Rockies began the 2008 season after few offseason changes from the National League champion squad of 2007.

In 1952 Pei and his team began work on a series of projects in Denver, Colorado.

A solo tour for In Your Dreams began on August 9, 2011 in Denver, Colorado.

He began production on Tribute to a Bad Man in the summer of 1955, but pulled out when the location shooting in Colorado gave him altitude sickness.

In 1932, the D & RGW began construction of the Dotsero Cutoff east of Glenwood Springs to near Bond on the Colorado River, at a location called Orestod ( Dotsero spelled backward ).

The Pike's Peak Gold Rush ( later known as the Colorado Gold Rush ) was the boom in gold prospecting and mining in the Pike's Peak Country of western Kansas Territory and southwestern Nebraska Territory of the United States that began in July 1858 and lasted until roughly the creation of the Colorado Territory on February 28, 1861.

The main unit began two days later with the circus train sequence at Alamosa, Colorado.

In the mid-19th century, the bands began to split, with some bands choosing to remain near the Black Hills, while others chose to remain near the Platte Rivers of central Colorado.

Efforts to make a wider peace continued, but in the spring of 1864, John Evans, governor of Colorado Territory, and John Chivington, commander of the Colorado Volunteers, a citizens militia, began a series of attacks on Indians camping or hunting on the plains.

Translated into present landmarks, their lands began in the north at Hoover Dam and ended about one hundred miles below Parker Dam on the Colorado River, or aha kwahwat in Mojave.

Weintraub insisted on a re-issue of the track and began a radio-airplay campaign that started in Denver, Colorado.

West Colfax Avenue began as a trail blazed during the Colorado Gold Rush, being a well-traveled direct route to the gold fields in the mountains.

It began at Santa Fe, thence to Durango, Colorado, crossed the Colorado River where Moab is now located, then to the Green River-crossing where Green River is now located, thence westerly to Cedar Mountain.

In 1996, Major League Soccer's original ten teams ; Columbus Crew, D. C. United, New England Revolution, NY / NJ MetroStars, Tampa Bay Mutiny, Colorado Rapids, Dallas Burn, Kansas City Wiz, Los Angeles Galaxy and San Jose Clash, began play.

In 1959, Gamow, Hans Bethe, and Victor Weisskopf publicly supported the re-entry of Frank Oppenheimer into teaching college physics at the University of Colorado, as the Red Scare began to fade.

The trail began at Young County, Texas and passed along the Pecos River, Fort Sumner, New Mexico, and Colorado before ending in Cheyenne, Wyoming.

However, the town's name and origin began when a post office was established January 6, 1871, on the Colorado River Indian reservation to serve the Indian agency.

After receiving her teacher certification from the University of Colorado in Boulder, she began teaching in Wabbaseka in 1897 and died there in 1944.

In 1949 the US Bureau of Reclamation began a mass project to dredge a new channel for the Colorado River that would straighten out a river bend that was causing massive silt problems since the Hoover Dam was completed.

The biggest news of the season came on July 30 when the Indians traded four prospects for Colorado Rockies star pitcher, Ubaldo Jiménez.

Although previous big-name pitchers, including Bill Swift, Bret Saberhagen, and Darryl Kile, had struggled in Colorado, following the 2000 season O ' Dowd made two very splashy signings in the free-agent market, signing Denny Neagle to a five-year contract worth $ 51 million, followed five days later by signing Mike Hampton to an eight-year, $ 121 million contract.

This made Colorado only the third team in the last half-century, and the first in the National League since the 1936 New York Giants, to have a 20 – 1 stretch at any point of a season.

Baseball America named the Colorado Rockies the " Organization of the Year " for their accomplishments during the 2007 season.

The following season, the Wings looked poised to " three-peat " for the first time in franchise history, acquiring three-time top blueliner Chris Chelios from his hometown Chicago Blackhawks in March 1999, but they would end up losing the Western Conference Semifinals to Colorado in six games.

The Wings posted the league's best record in the 2001-02 regular season and defeated Colorado in seven games in the Western Conference Finals after beating the Vancouver Canucks and St. Louis Blues in rounds one and two.

) On July 4, after losing a four-game road series in Colorado, the Giants ' record stood at 41 – 40 at the half-way point of the season.

The one silver lining was Tony Gwynn's eighth and final National League batting title, won in the final days of the season after a down-to-the wire duel with the Colorado Rockies ' Larry Walker.

The Padres opened their 1999 season in Monterrey, Mexico versus the Colorado Rockies.

The Padres ended the regular season in an 89 – 73 tie for the NL wild card with the Colorado Rockies.

In mid-summer Arapahos traveled into the Parks region of Colorado to hunt mountain herds, returning onto the Plains in late summer to autumn for ceremonies and for collective hunts of herds gathering for the rutting season.

The Astros honored Kile with a memorial plaque that hangs along the left field wall at Minute Maid Park under the 1997 Central Division Championship banner, the last season Kile played for Houston before signing with Colorado.

After the 1975-76 season, the franchise was moved to Denver and was renamed the Colorado Rockies.

In 1996 – 97, Colorado won the Pacific Division, as well as the Presidents ' Trophy for finishing the regular season with the best record in the league: 49 – 24 – 9 for 107 points.

In the following season, Colorado won the Pacific Division with a 39 – 26 – 17 record for 95 points.

It was in the 1999 – 2000 season that the Colorado Avalanche played their first game in the new Pepsi Center, that cost 160 million US dollars.

Although the salary cap was a blow to one of the highest spenders of the league, the Colorado Avalanche finished the 2005 – 06 regular season with a 43 – 30 – 9 record for 95 points, good enough to finish second in the Northwest Division, seven behind the Calgary Flames and tied with the Edmonton Oilers.

On May 9, 2008, the Colorado Avalanche Organization announced that Joel Quenneville would not return to coach the team next season.

Earning only 68 points in the standings, setting a franchise record for losing and winless streaks after the All-Star break, the Colorado Avalanche have seen their worst season yet since moving to Denver.

Colorado redeemed themselves in game two of the season on October 10, 2011 against the 2011 Stanley Cup champs, the Boston Bruins.

Suffering their worst season since 1977 – 78 the subsequent year, Keenan was fired midway through and replaced with Marc Crawford ( who had won the Stanley Cup with the Colorado Avalanche in 1996 ).

In 2002 – 03, the Canucks lost the division title to the Colorado Avalanche on the last day of the regular season.