TRANSIT OF VENUS

KaASBy

Khalid Marwat

June 2004, Rashidabad

“This sight...is by far the noblest astronomy affords...”

Edmund Halley

• KaAS observed• Next session?

This sight...is by far the noblest astronomy affords...

-Edmund Halley

Outer planets can never be at inferior conjunction

In 1996, descending Venus just barely missed transiting the sun. For 2004 and 2012, Venus crosses in front of the sun's disk. In 2020, the planet is sufficiently far above the plane of the earth's orbit when it descends to the right of the sun and thus does not transit the sun.

Similarly, not until this line of inferior conjunction regresses to the opposite node, after many eight year cycles, will the next pair of transits occur at Venus' ascending node in December, 2117 and 2125.

THERE WERE FIVE CONJUCTIONS IN EIGHT YEARS5 x 583,917 days = days 2,919.585 8 x 365,256 days = days 2,922.048

Venus is on its ascending node on 9 December, the descending node on 7 June.Almost exactly 243 years held 152 rounds and 395 synodic Venus cycles

CYCLE DURATION MULTIPLE RESULT

Synodic 583,917 152 x 583,917 days 88,755.4

Earth’s Year 365,256 243 x 365,256 days 88,757.2

Sidereal 224,701 395 x 224,701 days 88,756.9

Frequency is 105.5, 8, and 121.5 years

1600 1650 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150

Before 1600 there was no telescopeToV, an unobserved phenomenon; Kepler’s Rudolphine Tables in 1627 predictedKepler died on 15th Nov 1630

1631 and 1639; (not witnessed), most agreeable spectacle1761 and 1769; Global Expeditions, determination of AU and Black Drop1874 and 1882; Age of Photography2004 and 2012; Predominantly an amateur pursuit2117 and 2125; Far into the future

4,1639

7,1631

6,1882

9,1874

December Transits

June Transits

8,2125

11,2117

3,1769

6,1761

6,2012

8,2004

Transit Diagram

Predictions for KarachiExternal ingress

Sun Alt Internal Ingress

Sun Alt Greatest transit

Sun Alt Internal Egress

Sun Alt External Egress

Sun Alt

- - - - 01:32:37 10 04:35:46 50 04:53:14 54