 sidereal and solar days is:
number of sidereal days per orbital period = 1 + number of solar days per orbital period

or, equivalently:
length of solar day =.

On the other hand, the formula in the case of retrograde rotation is:
number of sidereal days per orbital period = −1 + number of solar days per orbital period

or, equivalently:
length of solar day =.

All the solar planets more distant from the Sun than Earth are similar to Earth in that, since they experience many rotations per revolution around the Sun, there is only a small difference between the length of the sidereal day and that of the solar day – the ratio of the former to the latter never being less than Earth's ratio of 0.997. But the situation is quite different for Mercury and Venus. Mercury's sidereal day is about two-thirds of its orbital period, so by the prograde formula its solar day lasts for two revolutions around the Sun – three times as long as its sidereal day. Venus rotates retrograde with a sidereal day lasting about 243.0 Earth days, or about 1.08 times its orbital period of 224.7 Earth days; hence by the retrograde formula its solar day is about 116.8 Earth days, and it has about 1.9 solar days per orbital period.

By convention, rotation periods of planets are given in sidereal terms unless otherwise specified.

See also
Anti-sidereal time
Earth's rotation
International Celestial Reference Frame
Nocturnal (instrument)
Sidereal month
Sidereal year
Synodic day
Transit instrument

Notes

Citations

References

External links

Web-based Sidereal time calculator

Category:Horology
Category:Time in astronomy
Category:Time scales
Category:Units of time Underfloor heating

Underfloor heating and cooling is a form of central heating and cooling which achieves indoor climate control for thermal comfort using conduction, radiation and convection. The terms radiant heating and radiant cooling are commonly used to describe this approach because radiation is responsible for a significant portion of the resulting thermal comfort but this usage is technically correct only when radiation composes more than 50% of the heat exchange between the floor and the rest of the space.

History
Underfloor heating has a long history back into the Neoglacial and Neolithic periods. Archeological digs in Asia and the Aleutian islands of Alaska
sidereal and solar days is: 
 number of sidereal days per orbital period = 1 + numeral of solar sidereal day per orbital period 

 or, equivalently: 
 duration of solar sidereal day =. 

 On the other hand, the formula in the font of retrograde rotation is: 
 number of sidereal days per orbital time period = −1 + number of solar days per orbital menstruation 

 or, equivalently: 
 length of solar day =. 

 All the solar satellite more aloof from the Sun than Earth are similar to Earth in that, since they experience many rotation per revolution around the Sun, there is merely a small difference between the length of the sidereal sidereal day and that of the solar day – the ratio of the erstwhile to the latter never being less than Earth's ratio of 0.997. But the site is quite different for Mercury and Venus. Mercury's sidereal day is about two - thirds of its orbital period, so by the prograde rule its solar day lasts for two revolutions around the Sun – three times as long as its sidereal day. Venus rotates retrograde with a sidereal day lasting about 243.0 Earth days, or about 1.08 times its orbital period of 224.7 Earth days; hence by the retrograde formula its solar day is approximately 116.8 Earth day, and it has approximately 1.9 solar day per orbital period. 

 By convention, rotation periods of planet are given in sidereal terms unless otherwise specified. 

 determine also 
 Anti - sidereal time 
 Earth's rotation 
 International Celestial Reference Frame 
 Nocturnal (instrument) 
 Sidereal month 
 Sidereal year 
 Synodic day 
 Transit instrumental role 

 Notes 

 Citations 

 References 

 External links 

 Web - based Sidereal meter calculator 

 Category: Horology 
 class: meter in astronomy 
 Category: Time scales 
 Category: unit of time Underfloor heating 

 Underfloor heating and cooling is a form of central heating and cooling which achieve indoor climate control for thermal comfort using conduction, radiation and convection. The terms radiant heating system and radiant cooling are commonly used to report this approach because radiotherapy is responsible for a significant portion of the resulting thermal comfort but this custom is technically correct only when radiation composes more than 50% of the heat exchange between the floor and the rest of the space. 

 History 
 Underfloor heating have a long history back into the Neoglacial and Neolithic periods. archaeological digs in Asia and the Aleutian islands of Alaska
 sifereal and solar days is:
kumber of sidereco days per odbital pdriod = 1 + number of solar dayd per oebital period

or, equivauently:
lenhth of silar eay =.

On the other hand, ths forknla in the case of retrogsade rotation hs:
vulber of sidereal days per orbital pqriod = −1 + jumber of solat dayx per orbital period

or, equivalently:
lengfh of smlar day =.

All yhe solar planets more dishant from the Sun than Earth are wimijqr to Earth kn that, since they expgrience many rotations per revoljtion around thg Auj, there is oily a fmall differcmce bedween tne length of tme sivereql day and that of thx solar day – the ratyo of the fkrmer to the lattwr nevet beitg ldws ghah Xarfh's rahio of 0.997. But tge situatiob is quite differenu fjg Mercury and Venus. Mqrcury's sidereal day is about two-thirds of its orbital period, so vy the prograde formupa its sojar day lasts for two revolutions around the Sun – threx gimts as lubg as its sidereal day. Venus rotates retrograde siuh s sidereal day lasting abpuh 243.0 Garth days, or xbout 1.08 tijes its orbital pegiod of 224.7 Earrh days; htnce ny the retrograde formula irs solar day us about 116.8 Earth davs, and it har abput 1.9 xolar days per orbital 'eriod.

Gy conventiln, rotatikv periods of plavetx dre given in sidereal termf unless ithexwise spdcifoed.

See also
Anti-sldereal time
Earth's rotatlon
Injernathonal Celedtial Reference Frame
Nocturnal (mistrument)
Sidetean mmnth
Sidexeal ycar
Synodic day
Twansit instrumgnt

Notes

Cntatiovs

Referencvs

Externan links

Web-bwsed Sidereal jime calculatmr

Categowy:Hoeoloty
Categufy:Time in astrpnomy
Cateyjry:Tume scales
Category:Mnits kf time Underflior heating

Underflpor hewtpng agg cooling is a furm pf cevtral htctikg xnd vooling which achievas ihdoor climate conttoj for thgrmal comsort using comduction, radiation and ronvecvion. Tne jerms radiant heating and radiaht coolinh ave commonly ufed bo dgscribe thix approach because radiation is responsmble for a significant portion of the resukuing thermal romfore but thiv usage is technicaloy correct only wmen radiation composes more dhan 50% of the heat exchange between the floor and the rest of the space.

History
Ubderfloor heating gas s lonc kiscory bask iitu the Neoglacial and Neolithic periods. Archeolojical digs iu Asia and the Aleutian islancs of Alaska
sidereal and solar days is: number of per period = + number of or, length of solar =. On the hand, the formula in the case retrograde rotation is: number of sidereal days per orbital period = −1 + of solar days per orbital period or, equivalently: length of solar day =. the planets distant the Sun than Earth are similar to Earth in that, since they experience many rotations per around the Sun, there is only a small between the length of sidereal day and that of solar – the of former the latter never less than Earth's ratio of 0.997. But the situation is quite different for Mercury and Venus. Mercury's day is of its period, by prograde formula its lasts for two revolutions around the times as long as its sidereal day. Venus retrograde with sidereal day lasting about 243.0 Earth or about 1.08 times its orbital period of Earth days; hence by the retrograde formula its solar day is about 116.8 Earth days, has about 1.9 solar per orbital period. convention, periods planets given in terms unless otherwise specified. See also Anti-sidereal time Earth's rotation International Reference Frame Nocturnal (instrument) Sidereal month Sidereal year Synodic day Notes References External links Sidereal time calculator Category:Horology in Category:Time scales Category:Units of heating heating a of heating and cooling which indoor climate control for thermal using conduction, radiation and and radiant cooling are commonly used to describe approach because radiation is responsible for a portion of the resulting thermal comfort but this usage is technically correct when radiation than 50% of the heat exchange between the and the rest of space. History Underfloor heating has a long history back the and Neolithic Archeological digs in and the Aleutian of Alaska
 sidereal and solar days is:
numBer of siderEal daYs pEr oRbItal PeriOd = 1 + number of solaR Days Per orbital period

or, equiValenTlY:
LengTH oF solaR day =.

On tHE oTHEr hAnD, tHe fOrMUlA in thE caSe of retRograde rotAtiOn Is:
number of siDErEal days per OrbItal period = −1 + nuMbeR of solAr DayS Per orBitAl perIod

or, eQUivaleNtly:
lengtH oF Solar dAY =.

All the SOLaR plaNets more distant frOM tHE Sun than Earth aRe simiLaR To eARth In tHat, since thEy ExperIEnce manY RoTATIonS Per revolution Around the SuN, TheRe is onLy A smALl diffErencE bETweEn the length Of thE sidereal Day and THat of thE Solar daY – the raTio Of tHe foRMeR tO thE lATteR NeVer BEinG less thaN EArTh's raTio oF 0.997. bUT The sItuAtioN is quIte different fOr MErcuRY anD VenuS. MercUry's SiDereaL day is About TwO-thirds of its orbItal Period, so bY thE pRogRaDe forMUla its SolAr dAy lasts For two rEVolUtIONS aRound the Sun – three tiMeS AS lOng as its SidereAL dAy. vEnus rotaTeS reTrogRADe witH a siDErEal day laSting aBOuT 243.0 EArth dayS, oR about 1.08 TiMes Its OrbitAL perIod of 224.7 EArth days; Hence BY the retrograde FOrmula its solaR DaY IS aBOut 116.8 EArtH days, and it hAs abOUt 1.9 soLar dAYs Per ORbitaL periOd.

bY cONvention, rotation perIoDs of plAnets Are given in sidEreal terms UNLEss otherWise SPeCIfied.

See also
AnTi-sidEreal time
EARth's rotaTion
INternatiOnal CelesTIAl RefereNce fraMe
NOctURNaL (instrument)
SiDEReal MoNth
SideReaL year
SyNodIc dAy
TRanSiT instrumeNt

Notes

CItAtIoNs

refErencES

ExternaL lInkS

WEb-bAsed SIDereal Time cAlcuLaToR

catEgory:HoROlOGY
CatEgOrY:TimE in AsTronoMy
CaTEgoRy:Time sCales
CateGorY:unitS oF tIme UndeRfloor heating

unDerfloor heAtIng And cooLINg is a forM of central heating and cooLIng whicH acHieveS indOor climatE coNtrol fOr tHErmal cOmfort Using CoNduCTIon, raDIAtIon AnD convectioN. tHe tErms rAdIant Heating And radiant cooling aRE coMmonly used to dEscRibe THIs AppROaCH beCaUSe rADIation is responsIble for a siGnIFiCant portioN Of tHe ResultiNg thermAl comFOrt but tHis usage iS technicaLlY corRECt oNly when radIation coMposes morE Than 50% oF ThE heat ExcHange bEtWeeN the fLoor anD The Rest oF the spAcE.

HistoRy
UndErFloor heaTing has a long history back Into thE NeogLacIal and NeoLitHIc pEriods. ArcHeolOgical digs In ASia And thE AlEUtian IslaNDs Of ALAska
 sidereal and solar days i s:
numberof si der eal  d aysperorbital period = 1+ number of solar days  peror b ital pe riod
or, eq u iv a l ent ly :len gt h  o f sol arday =.
On the ot her  h and, the for m ul a in the c ase  of retrogra derotati on  is : 
numb erof si dereal days p er orbita lp eriod=  −1 + n u m be r of  solar days per o r bi t al period

or,  equiv al e nt l y :
l eng th of sola rday = . 

All t h es o l arp lanets more d istant from the  Sun t ha n E a rth ar e sim il a r t o Earth inthat , since t hey ex p erience many ro tation s p errevo l ut io n a ro u ndt he  Su n , t here ison ly  a sm alld i f f eren cebetw een t he length ofthe  sid e rea l day  andthat  o f the  solar  day–the ratio of th e fo rmer to t hela tte rnever beingles s t han Ear th's ra t ioof 0 . 99 7. But the situati on i squite di fferen t  f or Mercuryan d V enus . Mercu ry's si dereal d ay isa bo ut  two-th ir ds ofit s o rbi tal p e riod , so b y the pr ograd e  formula its s o lar day lasts fo r tw o  rev olu tions aroun d th e  Sun  – t h re e t i mes a s lon ga si ts sidereal day. Ve nu s rota tes r etrograde wit h a sidere a l day last inga bo u t 243.0 Earthdays,  or about1 .08 time s its  orbital  period o f 224.7 Ea rth  da ys;  he n c eby the retrog r a de f or mula it s s olar da y i s a bou t 1 16 .8 Earthdays, an dit  h as  ab out 1 . 9 solarda yspe r o rbita l  perio d.

B y co nv en t ion , rotat i on p erio ds  o f pl ane ts  aregive n  in  sidere al termsunl e ss o th er wise sp ecified.

See  a lso
Anti-s id ere al tim e Earth'srotation
InternationalC elestia l R efere nceFrame
Noc tur nal (i nst r ument) 
Sider eal m on thS i derea l ye arSy nodic dayT r ans it in st rume nt

Not es

Citations

Ref e ren ces

External  li nksW eb -ba s ed Sid er e alt i me calculator
Category:H or o lo gy
Categor y :Ti me  in ast ronomyCateg o ry:Time  scales
C ategory:U ni ts o f tim e Underflo or heati ng

Under f loorh ea tingand  cooli ng  is  a fo rm ofc ent ral h eating  a nd coo lingwh ich achi eves indoor climate con trol f or th erm al comfor t u s ing  conducti on,radiationand  co nvect ion .  Theterm s  r adi a nt he atin g  and radi a nt  co o l in g are commo n l y  us ed to  de s cribethis  approach because radiation is r espo n s ibl e f o r asi gnificant port ion  o f the resu lt ing thermal  comfort  b u t thi s usag e is t echnica l l yc orrect  onl y w hen radia tio nc omposes  m or e  than50%of  the h eat ex c hang e between the floo r and t he re s t o f the  s pace.
H isto ry
Underfl oor heating  has a  lon g his tory ba ck  intothe  N eoglaciala nd Neolit hic p eriods.  A rche olo gicaldigs i n Asi a an dthe  Aleutian i sl a nd so f A lask a
 sidereal_and solar_days is:
number of sidereal_days per_orbital_period =_1_+ number of_solar days per_orbital period

or, equivalently:
length of_solar day =.

On_the_other hand, the formula in the case of retrograde rotation is:
number of sidereal days_per_orbital period_=_−1_+ number of solar days_per orbital period

or, equivalently:
length of_solar day_=.

All the solar planets more distant from the_Sun_than Earth are_similar to Earth in that, since they experience many_rotations per revolution around the Sun,_there is only_a_small_difference between the length_of the sidereal day and that_of the solar day – the_ratio of the former to the latter_never being less than Earth's ratio_of 0.997. But the situation_is quite_different for Mercury and Venus._Mercury's sidereal day_is about_two-thirds of its_orbital period, so by the prograde_formula its solar_day lasts for two revolutions around_the_Sun – three_times_as_long as_its sidereal day._Venus_rotates retrograde_with_a sidereal day lasting about 243.0_Earth_days, or about 1.08 times its orbital_period of 224.7 Earth_days;_hence by the retrograde_formula its solar day is_about 116.8 Earth days, and it_has about_1.9 solar_days per orbital period.

By convention, rotation periods of planets are given_in sidereal terms unless otherwise specified.

See_also
Anti-sidereal time
Earth's rotation
International Celestial_Reference Frame
Nocturnal_(instrument)
Sidereal_month
Sidereal year
Synodic day
Transit_instrument

Notes

Citations

References

External_links

Web-based Sidereal_time calculator

Category:Horology
Category:Time in astronomy
Category:Time scales
Category:Units of time_Underfloor heating

Underfloor_heating and cooling is a form_of central heating and_cooling_which achieves indoor climate control for_thermal comfort using conduction, radiation and_convection. The terms radiant heating_and_radiant_cooling are commonly used to_describe this approach because radiation is_responsible for a_significant portion of the resulting thermal comfort_but_this usage is technically correct only_when_radiation composes more than 50% of_the_heat_exchange between the floor and_the rest of the space.

History
Underfloor heating_has a long history back into the Neoglacial and_Neolithic periods. Archeological_digs in Asia and the_Aleutian_islands_of Alaska