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〃e back and meet Max；〃 came Yaeger's voice from behind the illusionary chamber。 〃Then we'll get to work。〃
Pat was on the verge of saying 〃I can't；〃 because the chamber seemed so real。 But she broke the illusion by stepping through the wall as if she were a ghost； and rejoined Yaeger behind the console。
〃Max；〃 said Yaeger； 〃meet Dr。 Pat O'Connell。〃
〃How do you do？〃 came a soft feminine voice。
Pat eyed Yaeger suspiciously。 〃Max is a woman。〃
〃I programmed my own voice into the original program。 But I've made any number of modifications since then and decided that I'd rather listen to a female voice than that of a male。〃
〃She's voice…activated？〃
Yaeger smiled。 〃Max is an artificial intelligence system。 No buttons to push。 Just talk to her like you would a normal person。〃
Pat looked around。 〃Is there a microphone？〃
〃Six； but they're miniatures you can't see。 You can stand anywhere within twenty feet。〃
Apprehensively； Pat said； 〃Max？〃
On the huge monitor just beyond the platform； the face of a woman appeared。 She stared at Pat in vivid color。 Her eyes were topaz brown and her hair a shiny auburn。 Her lips were spread in a smile that revealed even white teeth。 Her shoulders were bare down to the tops of her breasts； which just showed above the bottom of the monitor。 〃Hello； Dr。 O'Connell。 I'm pleased to meet you。〃
〃Please call me Pat。〃
〃I shall from now on。〃
〃She's lovely；〃 said Pat admiringly。
〃Thank you。〃 Yaeger smiled。 〃Her real name is Elsie； and she's my wife。〃
〃Do you work well together？〃 Pat asked facetiously。
〃Most of the time。 But if I'm not careful； she can get as testy and petulant as the original。〃
〃Okay； here goes；〃 Pat murmured under her breath。 〃Max； have you analyzed the symbols that were scanned into your system？〃
〃I have。〃 Max's voice answered in tones that sounded positively human。
〃Could you decipher and translate any of the symbols into the English alphabet？〃
〃I've only scratched the surface； but I have made progress。 The inscriptions on the ceiling of the chamber appear to be a star chart。〃
〃Explain。〃 Yaeger ordered。
〃I see it as a sophisticated coordinate system that is used in astronomy to plot the positions of celestial objects in the sky。 I think it might suggest changes in the declinations of stars visible in the sky over a particular part of the world in past epochs。〃
〃Meaning that because of deviations in the earth's rotation； the stars appear to shift positions over time。〃
〃Yes； the scientific terms are precession and nutation；〃 Max lectured。 〃Because the earth bulges around the equator from its rotation； the gravitational pull of the sun and moon is heaviest around the equator and causes a slight wobble to the earth's spinning axis。 You've seen the same phenomenon in a spinning top； due to gravity。 This is called precession； and it traces a circular cone in space every 25；800 years。 Nutation； or nodding； is a small but irregular movement that swings the celestial pole 10 seconds away from the smooth precessional circle every 18。6 years。〃
〃I know that sometime in the distant future；〃 said Pat； 〃Polaris will no longer be the North Star。〃
〃Exactly；〃 Max agreed。 〃As Polaris drifts away； another star will move into position above the North Pole in approximately 345 years。 A hundred years before the time of Christ； the vernal equinox Excuse me； are you familiar with the vernal equinox？〃
〃If I remember my junior college astronomy；〃 said Pat； 〃the vernal equinox is where the sun intersects the celestial equator from south to north during the spring equinox； making it a reference direction for angular distances as measured from the equator。〃
〃Very good；〃 Max plimented her。 〃Spoken like a college professor putting her class to sleep。 Anyway； before Christ； the vernal equinox passed through the constellation Aries。 Because of precession； the vernal equinox is now in Pisces and is advancing toward Aquarius。〃
〃What I think you're telling us；〃 said Pat； elation beginning to grow in her chest； 〃is that the starlike symbols in the ceiling in the chamber display coordinates of the star system from the past。〃
〃That's how I read it；〃 Max said impassively。
〃Did the ancients have the scientific knowledge to make such accurate projections？〃
〃I'm finding that whoever carved that celestial map in the ceiling of the chamber was superior to the astronomers of only a few hundred years ago。 They calculated correctly that the celestial galaxy is fixed and that the sun； the moon； and the planets revolve。 The map shows the orbits of the planets； including Pluto； which was discovered only in the last century。 They discovered that the stars Betelgeuse； Sirius； and Procyon remain in permanent positions； while other constellations move imperceptibly over thousands of years。 Believe me； these ancient people knew their stuff when it came to stargazing。〃
Pat looked at Yaeger。 〃If Max can decipher the star coordinates as engraved in the chamber when it was built； we might be able to date its construction。〃
〃It's worth a try。〃
〃I deciphered a small part of the numbering system；〃 said Pat。 〃Would that help you； Max？〃
〃You shouldn't have bothered。 I have already interpreted the numbering system。 I find it quite ingenious for its simplicity。 I can't wait to dig my bytes into the inscriptions that spell out words。〃
〃Max？〃
〃Yes； Hiram。〃
〃Concentrate on deciphering the star symbols and put aside the alphabetic inscriptions for now。〃
〃You'd like me to analyze the celestial map？〃
〃Do the best you can。〃
〃Can you give me until five o'clock？ I should be able to get a handle on it by then。〃
〃The time is yours；〃 Yeager responded。
〃Max only requires a few hours for a project that should take months； even years？〃 Pat asked incredulously。
〃Never underestimate Max；〃 said Yaeger； swinging around in his chair and sipping from a cup of cold coffee。 〃I spent the better part of my prime years putting Max together。 There isn't another puter system like her in the world。 Not that she won't be obsolete in five years。 But for the present； there is very little she can't do。 She is unique； and she belongs heart and soul to me and NUMA。〃
〃What about patents？ Surely you must turn your rights over to the government。〃
〃Admiral Sandecker is not your average bureaucrat。 We have a verbal contract。 I trust him； and he trusts me。 Fifty percent of any revenue that we make on patent royalties or charges for the use of our accumulated data to private corporations or government agencies is turned over to NUMA。 The other fifty percent es to me。〃
〃You certainly work for a fair…minded man。 Any other employer would have given you a bonus； a gold watch； and a pat on the back； and taken your profits to the bank。〃
〃I'm lucky to be surrounded by fair…minded men；〃 said Yaeger solemnly。 〃The admiral； Rudi Gunn； Al Giordino； and Dirk Pitt； they're all men I'm proud to call my friends。〃
〃You've known them for a long time。〃
〃Close to fi