
landan dial

vyaapak arthon mein ack landan dial kaa arth kissy bhee suryakanti seey hoe sakata haye joe 51°30′n key liye nirdhaarit haye, lekin adhik vishesh roop seey ack vishisht design key saath utkeern peetal kshaitij suryakanti koo sandarbhit kartaa haye.
landan dial mool roop seey vaigyaanik upkaran nirmaataon dwara utkeern kiye gaye they. vyaapaar koo shilp sanghon kii pranali dwara bahut adhik sanrakshit kiya gayaa thaa. 
ack kshaitij dial.
ack nomon yaa shally koo khagoliya uttari dhruv parr ingit karane key liye sett kiya jaataa haye, soorya kii chhaaya dial plate parr daali jaati haye aur varsh key pratyek dinn ack hii sthiti mein dikhaai degi, aur iss sthiti kii ganana trikonamiti kaa upayog karke kii jaa sakati haye, yaa jyaamitiya nirmaan kaa upayog karke kheenchi jaa sakati haye. 
soorya key prakaash kii duniya mein kuchh takniki shabd bhasha key ack puraane roop kaa upayog karate hain, isaliye jiss konn parr shally nirdhaarit kii jaati haye usey shally kii oonchaai kahaa jaataa haye. shally kii oonchaai bhaugolik akshansh key samaan haye, aur landan mein yeh 51 degree 30 minut yaa 51.50 degree thee, joe motey taur parr westminster pull key saath mell khaati haye.
gnomon kii motai hoti haye, aur iss prakaar dou chhaaya fenkane vaale kinare (shailiyaan) ack subah key liye aur ack dopahar key liye, dialplate parr gnomon kii chaudaai key liye ack antaral bachaa haye.
ack suryakana sthaaniya spasht samay koo pradarshit karati haye, aur joe ghadiyaan ausat samay yaa ausat samay kaa upayog karati hain, way hamesha thode antar parr hongi. samay key iss antar kii ganana kii jaa sakati haye aur dial parr pradarshit kiya jaa sakata haye-phir seey purani bhasha kaa upayog karke ise samay key sameekaran key roop mein jaanaa jaataa haye.
landan dial ghante kii rekhaaen dikhaata haye, kuchh aadhe ghante key marker, chauthai ghante aur kuchh division aadhe chauthai (saadhe saat minut) kaa pratinidhitva karate hain. samay key sameekaran koo teen valayon key roop mein dikhaaya gayaa haye, jisamen shabd "dheemi gati seey dekhein, teji seey dekhein", maheene aur taareekhen aur bhinnata key samay key minut dikhaae gaye hain.
jyaamitiya nirmaan.
aisaa karane key kaee tareeke hainh 1652 mein leiborne dwara prakaashit ack abhee bhee lokpriya haye. haalaanki 1790 mein dome francois bedos dee cell dwara ack adhik vyaapak roop seey jaanaa jaataa haye.
jyaamitiya markup takneek.
ack kshaitij dial, ack bhoomadhyarekhiya dial kii sambhaajak ghante kii rekhaaon koo letaa haye aur unhein shally key tirchhe ack samtal parr prakshepit kartaa haye, markup iss parivartan kaa anukaran kartaa haye.
dome francois bedos dee cells vidhi (1760) jise anyatha vau vidhi (1973) key roop mein jaanaa jaataa haye. 
"chetaavanih inn aarekhon kaa sateekta key liye pareekshan naheen kiya gayaa haye. uttar mein dial jitna chauda hoga."