Table 1: Precessional quantities determined with different sources. Units: coefficients in arcsecond and time in century.
Source $t\quad$ $t^2\quad$ $t^3\quad$ $t^4\quad$

L77 $P_{\rm A}$ 4.1976   0.19447     -0.000179

(Newcomb) $Q_{\rm A}$ -46.8150   0.05059     0.000334

from S94 $P_{\rm A}$ 4.199706 0.1939713 -0.00022351 -0.000001036

(VSOP87) $Q_{\rm A}$ -46.809269 0.0510429 0.00052233 -0.000000567

W94 $P_{\rm A}$ 4.199610 0.193971   -0.000223     -0.000001

(VSOP87+IERS1992 masses) $Q_{\rm A}$ -46.809560 0.051043   0.000522     -0.000001

P03 $P_{\rm A}$ 4.199094 0.1939873 -0.00022466 -0.000000912

(VSOP87+Fit to DE406) $Q_{\rm A}$ -46.811015 0.0510283 0.00052413 -0.000000646

**Table 1:** Precessional quantities determined with different sources. Units: coefficients in arcsecond and time in century.
Source		$t\quad$	$t^2\quad$	$t^3\quad$	$t^4\quad$
L77	$P_{\rm A}$	4.1976	0.19447	-0.000179
(Newcomb)	$Q_{\rm A}$	-46.8150	0.05059	0.000334
from S94	$P_{\rm A}$	4.199706	0.1939713	-0.00022351	-0.000001036
(VSOP87)	$Q_{\rm A}$	-46.809269	0.0510429	0.00052233	-0.000000567
W94	$P_{\rm A}$	4.199610	0.193971	-0.000223	-0.000001
(VSOP87+IERS1992 masses)	$Q_{\rm A}$	-46.809560	0.051043	0.000522	-0.000001
P03	$P_{\rm A}$	4.199094	0.1939873	-0.00022466	-0.000000912
(VSOP87+Fit to DE406)	$Q_{\rm A}$	-46.811015	0.0510283	0.00052413	-0.000000646

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