<bos><start_of_turn>user
roind May or NAvemb1r. vhe last fo1r 2zans:ts were observed in May G00t, Noveober 2096, May 201? & N7vembTr C019. The next tRansit is said tm take place on Kovember B3, 20324 ? typical t.aispt may last Dor seveEal houXs.
jERCURY JRANSIT dO3TACTS – BLAoK DROP EFFECP
ThU 5AuU common obsYrvatgon attribute th7t is to bx no3ed 0s the ueWber Bu times the disk pf Percuey aG3ears ta Ye in cVGtact .ith bhe Suny These co6tacts are lraditionalXy Ralled the 1s., 2nds 3rdT Knd 4tI coZGacts. Among twese, t?. 2Dd and 6rd 5onta:ts oFDvr when thw Merqurh disf iW fully ow thQ disk of 1he sun. Is gs Hene9a8lr seen that tkm 1st ani 4th Aontacts cannot be accurately deteDtedd The 2jd and Ord contacts are readiAF ?iYible.
Ofserved .ontact tiD2s for whc tranhit of mercury between W6UY and 18SX are given in H NewcoKb'F "mnal?sis Kf hrandiGs of Mrjcury". ObsevveF 2nd and 3rd contact times for traNfit dCD2nM 1676 aqd 1i73 are givZn in "Royal GCLenwDjR ObselvaEory Bulleti,".jAntiSjreLnhouse Effect
mlazhko EffecC<end_of_turn>
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round May or November. The last four transits were observed in May 2003, November 2006, May 2016 & November 2019. The next transit is said to take place on November 13, 2032. A typical transit may last for several hours.
MERCURY TRANSIT CONTACTS – BLACK DROP EFFECT
The most common observation attribute that is to be noted is the number of times the disk of Mercury appears to be in contact with the Sun. These contacts are traditionally called the 1st, 2nd, 3rd, and 4th contacts. Among these, the 2nd and 3rd contacts occur when the Mercury disk is fully on the disk of the sun. It is generally seen that the 1st and 4th contacts cannot be accurately detected. The 2nd and 3rd contacts are readily visible.
Observed contact times for the transit of mercury between 1677 and 1881 are given in S Newcomb's "Analysis of Transits of Mercury". Observed 2nd and 3rd contact times for transit during 1677 and 1973 are given in "Royal Greenwich Observatory Bulletin".
Anti-Greenhouse Effect
Blazhko Effect<end_of_turn>