In Table 3 (click here), we show the several equator corrections obtained from observations at Valinhos based on different selections of observational material. It seems that the better correction is that from our global reduction method.
It must be pointed out that, in our case, we estimated the
equator
correction and 
corrections for the declination
zone
of the astrolabe observations at Valinhos
(
, south hemisphere) shown in
Fig. 2 (click here).
Figure 2: The declination distribution of the data
We compare the absolute declinations obtained in this paper with the published (FK5-FK4) differences. There is a good correlation between these data (Fig. 3 (click here)).
| Object | M.E.O. |  ( ) |
 () | remarks |
| Sun | 1980.9 | +0.07 | 0.14 | Leister (1989) - (OAM astrolabe data) |
| Sun | 1983.0 | -0.01 | 0.04 | Penna et al. (1996) - (OAM/CERGA/ON astrolabe data) |
| Stars | 1983.0 | +0.06 | 0.09 | Clauzet et al. (1990) - (OAM astrolabe data) |
| Sun | 1990.0 | +0.08 | 0.07 | Poppe (1994) - (OAM/CERGA astrolabe data) |
| Sun | 1990.7 | -0.03 | 0.01 | Poppe et al. (1996) - (OAM/CERGA astrolabe data) |
| This paper | 1980.7 | -0.04 | 0.02 | Krejnin's Method |
| (Stars) | -0.04 | 0.02 | Krejnin's Method | |
| +0.06 | 0.17 | Krejnin's Method | ||
| +0.07 | 0.17 | Krejnin's Method | ||
| -0.06 | 0.04 | Method of Differences | ||
| +0.02 | 0.12 | Method of Differences | ||
| +0.028 | 0.034 | Global Reduction | ||
|
|
The analysis of Fig. 3 (click here) confirms that the results are in agreement with the published values and that the Valinhos catalogues can represent corrections to the FK4 catalogue in the same sense that the FK5 does.
with 