Sunrise Defintion Selection Question ?

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|| Jaya Jagannath ||

Dear Dhira Krsna dasa,

 

My comments below:

 

Best Wishes

Sarajit Poddar

SJC- Asia

 

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jhora

Thursday, July 17, 2003 4:02:45 AM

jhora

Re: Sunrise Defintion Selection Question ?

 

Dear Rao and Narasimha,Hare Rama Krsna!Just wanted to give my two pence opinion about the sunrise definition.Option-3 The tip of Sun appearing on eastern horizon, I don't reallyunderstand what is meant with this. Is it the apparent rising of Sun disktaking into account parallax factor or something? Or is it what isactually seen as Sun's tip rising, depending on the place one observes it?In the last case, the sunrise will be different from meter to meter, asone can live in a mountainous place, and thus see the sunrise considerablydifferent from say a 100 m distance from there. Also, trees, houses, canblock the vision so one cannot really trust what is the actual sunrisetime then.

[sP] Ancient times all the activites used to be closely link to the Sun's movement and hence the rising and setting time of the Sun was given prime importance. Now what is meant by rising is the issue here. For those people, rising meant when the first ray of Sun was visible on the horizon. This cannot be the center of the Sun rising on the horizon as by that time the half of the solar disk would have risen on the horizon.

But now, what is the difference between the apparent rising and real rising of the Sun's upper tip? We know that the earth is covered by a thick layer of atmosphere, which due to refraction, bends the light. Thus, the first ray of Sun appears on the Horizon, even if the Tip of the sun is below the horizon. Thus the apparent rising would be the time when we see the Sunlight on the horizon, irrespective of whether it has reached the horizon.

Now as you said the apparent rising could be difficult as the environment can be blocked by Trees or Mountains or like... but I think this would only make differences in few secs in Sunlight.... However, I "feel" that this should be the time, when Sun's first ray would be visible on the Horizon on a plane and not obstructed by anything. Moreover the day should be a clear and normal day as the refractive index of the atmosphere would vary with the quality of the Atmosphere.

Considering the other two options, it doesn't really matter to take tip orcenter, from the point of view of actually observing the sunrise, for thesame reason as given above. Therefore the option I prefer is option - 1,center of Sun's disk. In the case of Vimsottari dasha - do we calculatefrom Moon's tip or Moon's center for the correct longitude of Moon? In thesame way, then why would we calculate Sun's tip rather than Sun's centerfor the actual longitude of Sun? We do count from the ascending degree tothe descending degree (180° from each other) in 7th house for theinvisible half of zodiac and from 7th to lagna for visible half of thezodiac. Then isn't it the actual longitude of Sun (center) crossing theascending degree which marks Sunrise?

[sP] When we map the Sun in the zodiac, we use the center of the Sun and not any tip like any other planet. For illustration, when we say that Sun is in the 10deg Aries, we mean that Sun's Center is in 10deg Aries. This is the reason, why we cannot take the Lagna starting from the Sun's longitude but some 50-60 Arcsecs behind the solar longitude at Sunrise... Or, the Lagna Transits over the Solar Longitude approximately after 4 mins.

If Center of Sun option is chosen, then at Sunrise, the Lagna and the solar longitude would be the same. As we know that anything rises (center of that planet) above the horizon, when Lagna moves over that body. So the solar tip would rise, when Lagna moves over it! and hence if solar tip option is chosen, at sunrise, the lagna transits the tip of the Sun, which is approximately 1deg (longitude) away from the Sun's center (which is Sun's longitude). In this case, the Sun's logitude (Sun's Center) rises approximately after 4 mins.Anyway, this is my opinion. I'm sure it's shared by many others as well.For research, have a look at the attached chart - from a jyotishi'sdaughter who had the time of birth taken accurately to the second (if wecan believe the doctor who did the caesarean birth) and this is the timeof cutting umbilical cord.Yours,Dhira Krsna dasa,Jyotishahttp://www.radhadesh.com

[Guest guest]

Dear Sarajit,

 

Hare Rama Krsna!

 

I'll just reply with a verse from BPHS. You say sunrise is when first rays

of the Sun become apparent in the sky. As far as my eyes can observe and

knowledge reaches, sunrays already appear in the sky at dawn, long before

the Sun rises. Then how can you say it denotes Sunrise?

 

>[sP] Ancient times all the activites used to be closely link to the Sun's

>movement and hence the rising and setting time of the Sun was given

>prime importance. Now what is meant by rising is the issue here. For

>those people, rising meant when the first ray of Sun was visible on the

>horizon. This cannot be the center of the Sun rising on the horizon as by

>that time the half of the solar disk would have risen on the horizon.

 

Let's quote Parasara in BPHS Ch. 9 text 14 Definition of Sandhya:

" 3 Ghatikas before the sight of the semi disc (half) of the rising Sun and

a similar duration following the Sun set are called as morning twilight

and evening twilight respectively. "

 

Similarly, another description of sandhya is there in Ch. 46, texts 44-49

with reference to semi-disc of Sun.

 

Why Parasara mentioned the semi disc here, and not the tip of the disc, as

Sunrise? Please explain.

 

Yours,

Dhira Krsna dasa,

Jyotisha

http://www.radhadesh.com