The press widely covered the accident and many reports emphasized the luck in not losing a large cabinet of spectrograms which was knocked over by the crash coming through an astronomer's office window.

The railway fell in stages to the Echo Mountain House fire, a kitchen fire on February 4, 1900 ; a wind-aided brush fire on Echo Mountain in 1905, which wiped out everything except the observatory and the astronomer's cabin ; a Rubio Canyon flash flood in 1909 that destroyed the Pavilion ; and an electrical fire that razed the Tavern in 1936.

The range of amateur astronomer's telescopes is wide, with numerous types and designs, such as achromatic and apochromatic refractors, Newtonian reflectors, Schmitt-Cassegrain, Maksutov-Cassegrain and Maksutov-Newtonian compound reflectors.

The astronomer's surname, and hence the star identifier, is sometimes indicated by a Greek sigma, Σ.

In August 1665, at the age of nineteen and as a gift for his friend Litchford, Flamsteed wrote his first paper on astronomy, entitled Mathematical Essays, concerning the design, use and construction of an astronomer's quadrant, including tables for the latitude of Derby.

With its ability to make X-ray images of star clusters, supernova remnants, galactic eruptions, and collisions between clusters of galaxies, in its first decade of operation it has transformed astronomer's view of the high-energy universe.

[...] This search for the origins of human institutions and cultural creations prolongs and completes the naturalist's quest for the origin of species, the biologist's dream of grasping the origin of life, the geologist's and the astronomer's endeavor to understand the origin of the Earth and the Universe.

Although the king had been persuaded by Ole Rømer to introduce the Gregorian calendar in Denmark-Norway in 1700, the astronomer's observations and calculations were among the treasures lost to the fire.

Rupert was named Persephone, but nicknamed Rupert after an astronomer's pet parrot.

* Jess K. Gilmour, The practical astronomer's deep-sky companion.

* The practical astronomer's deep-sky companion by Jess K. Gilmour.

Its outer atmosphere has an effective temperature of 4, 036 K. Compared to the Sun, this star, and the primary component, show only half the abundance of elements other than hydrogen and helium — what astronomer's term their metallicity.

Kirwitzer there are annual Kirwitzer Days organized in Kadaň, the astronomer's birthplace.

The climate is tropical, specifically a tropical wet and dry climate ( Köppen Aw ), with monthly mean temperatures in the range of, and relative humidity between 71 and 81 %.

Milanković selected this rule because its mean year was within two seconds of the then current length of the mean tropical year.

19th-and 20th-century astronomical observations revealed that the mean solar day is slowly but measurably lengthening and the length of a tropical year is not entirely predictable either ; thus the sun – earth motion is no longer considered a suitable basis for definition.

The tropical year in the 1960 definition was not measured but calculated from a formula describing a mean tropical year that decreased linearly over time, hence the curious reference to a specific instantaneous tropical year.

The average length of this calendar's year is mean solar days ( as 97 out of 400 years are leap years ); this is within one ppm of the current length of the mean tropical year ( days ).

Although this is closer to the mean tropical year of 365. 24219 days, his proposal has never been adopted because the Gregorian calendar is based on the mean time between vernal equinoxes ( currently 365. 2424 days ).

It is a typical tropical to subtropical tree and exists at annual mean temperatures between.

This is 20 < sup > m </ sup > 24. 5128 < sup > s </ sup > longer than the mean tropical year at J2000. 0.

" Tropical " is sometimes used in a general sense for a tropical climate to mean warm to hot and moist year-round, often with the sense of lush vegetation.

He first investigated the rate of decrease in mean temperature with the increase in elevation above sea level, and afforded, by his inquiries regarding the origin of tropical storms, the earliest clue to the detection of the more complicated law governing atmospheric disturbances in higher latitudes ; while his essay on the geography of plants was based on the then novel idea of studying the distribution of organic life as affected by varying physical conditions.

In either case, his calendar was more accurate to the mean tropical year than the Gregorian calendar of 500 years later.

The duration of the mean calendar year of such a calendar approximates some form of the tropical year, usually either the mean tropical year or the vernal equinox year.

The city is the northernmost city on the west coast of Florida that has a tropical climate, having a mean January temperature of.

Palm Beach, and the rest of southern Florida has a tropical climate, with mean temperatures any month never below.

The quasi-biennial oscillation ( QBO ) is a quasi-periodic oscillation of the equatorial zonal wind between easterlies and westerlies in the tropical stratosphere with a mean period of 28 to 29 months.

The fact that the Deerstalker and the Jet were the only completely new designs this year doesn't mean that 1961 didn't see changes in models, actions and calibers.

The rust inhibitors in the fluid are used up after one year, and you don't want to risk the rust that two years' use could mean.

Years ago when I asked her to put me in Social Security, so's I wouldn't have to be working now, Miss Julia threatened to fire me -- all because it would mean a few more dollars a year to her ''.

For hotels with 1000 rooms, the increased license fee would mean an expense of $5000 a year, Goodis said.

For example, " biweekly " can mean " fortnightly " ( once every two weeks – 26 times a year ), or " twice a week " ( 104 times a year ).

In his Rudolphine Tables ( 1627 ), Johannes Kepler used a prototype of year zero which he labeled Christi ( Christ ) between years labeled Ante Christum ( Before Christ ) and Post Christum ( After Christ ) on the mean motion tables for the Sun, Moon, Saturn, Jupiter, Mars, Venus and Mercury.

Then in 1702 the French astronomer Philippe de la Hire used a year he labeled at the end of years labeled ante Christum ( BC ), and immediately before years labeled post Christum ( AD ) on the mean motion pages in his Tabulæ Astronomicæ, thus adding the designation 0 to Kepler's Christi.

The length of the interval between two such successive events may be allowed to vary slightly during the year, or it may be averaged into a mean solar day.

Because the sun's mean motion was used to calculate the jieqi, or seasonal markings, until 1645, this intercalary month was equally likely to occur after any month of the year.

Though the fact of the irregularity of the lunar orbit was known in the 1st century BC, the starts of the months were calculated using the mean motions of both the sun and moon until 619, the second year of the Tang dynasty, when chronologists began to use true motions modeled using two offset opposing parabolas ( with small linear and cubic components ).

In addition, without changes to either calendar, the frequency of monthly divergence between the two festivals will increase over time as a result of the differences in the implicit solar years: the implicit mean solar year of the Hebrew calendar is 365. 2468 days while that of the Gregorian calendar is 365. 2425 days.

Following this, an astronomical conference held in Paris in 1950 recommended " that in all cases where the mean solar second is unsatisfactory as a unit of time by reason of its variability, the unit adopted should be the sidereal year at 1900. 0, that the time reckoned in this unit be designated ephemeris time ", and gave Clemence's formula ( see Definition of ephemeris time ( 1952 )) for translating mean solar time to ephemeris time.

Paul Verhoef, the then current satellite navigation program manager at the European Commission indicated that this limited funding would have serious consequences commenting at one point " To give you an idea, that would mean that for three weeks in the year you will not have satellite navigation " in reference to the currently proposed 18 vehicle constellation.

The Hebrew calendar year is longer by about 6 minutes and 25 +< sup > 25 </ sup >/< sub > 57 </ sub > seconds than the present-day mean solar year, so that every 224 years, the Hebrew calendar will fall a full day behind the modern solar year, and about every 231 years it will fall a full day behind the Gregorian calendar year.

Since about the 3rd century CE, the Jewish calendar has used the Anno Mundi epoch ( Latin for “ in the year of the world ,” abbreviated AM or A. M .; Hebrew ), sometimes referred to as the “ Hebrew era .” According to Rabbinic reckoning, the beginning of " year 1 " is not Creation, but about one year before Creation, with the new moon of its first month ( Tishrei ) to be called molad tohu ( the mean new moon of chaos or nothing ).