His Gross RA will be 90 degrees, longitude 90 and Declination maximum at 23 deg 27 minutes.
At Vishu, since Sin 0 = 0, all values become Zero,
Sun’s RA, Sun’s Longitude and Declination.
At Ramayana Day, since Sin 90 =1,
Sin J = SIn R Sin w
Sin J = Sin 90 * Sin (23 D 27 Mins)
= 23 D 27 mins