Compiled by Dr. Irv Bromberg, University of Toronto, Canada

Yerm concept and calendar defined by Karl Palmen at ''Yerm Lunar Calendar'' <http://www.hermetic.ch/cal_stud/palmen/yerm1.htm>.

A yerm is an odd-length sequence of alternating full (F=30 days) and deficient (D=29 days) lunar calendar months that starts and ends with a full month.
The most accurate yerms for traditional molad interval approximation are FDFDFDFDFDFDFDFDF = 17 months and FDFDFDFDFDFDFDF = 15-months.
The traditional molad interval = 29+13753/25920 days = 29 days 12 hours 44 minutes and 3+1/3 seconds.
The 17-month yerm mean month = (9 × 30 + 8 × 29) / 17 = 29+9/17 days = 29 days 12 hours 42 minutes and 21+3/17 seconds, shorter than but closest to the traditional molad interval. Any longer yerm has a shorter mean month.
The 15-month yerm mean month = (8 × 30 + 7 × 29) / 15 = 29+8/15 days = 29 days 12 hours and 48 minutes, longer than but closest to the traditional molad interval. Any shorter yerm has a longer mean month.

Era#, Month#, Day# = era number and total elapsed months and days at the start of that era.
JD = era start Julian Day number.
Fixed = era start fixed day number (day 1 = Gregorian Mon, Jan 1, 2001).
Gregorian Date = era start Gregorian date.
hYear, hMonth = era start Hebrew year and month.
HCEM = Hebrew calendar elapsed months, relative to zero = Hebrew epoch.
N = number of consecutive 49-month subcycles in era (17+17+15 months). Every era ends with one 17-month yerm.
The 49-month subcycle mean month = (26 × 30 + 23 × 29) / 49 = 29+26/49 days = 29 days 12 hours 44 minutes and 4+44/49 seconds,
slightly longer than the traditional molad interval. The number of subcycles together with the final 17-month yerm fine-tunes the era mean month.
Days, Yerms = number of days and yerms in era. Yerm numbers divisible by 3 have 15 months, otherwise 17 months.
n29, n30 = number of deficient 29-day and full 30-day months in era: n29 = (Months - Yerms) / 2, n30 = n29 + Yerms.
Months = number of months in era = (2 × Days - Yerms) / 59 = n29 + n30. Months have 29 + month MOD 2 days.
Excess = mean month as the number of seconds in excess of 29 days 12 hours and 44 minutes (29+191/360 days).
Fraction = excess seconds in exact mixed fraction format.
The mean month itself is not shown because for each era it is always exactly n30 / Months + 29 days.

Era#, Month#, and Day# counted from the first era that ended after the traditional Hebrew calendar epoch, for 5 complete molad yerm era cycles.

Era#Month#Day#JDFixedGregorian DatehYearhMonthHCEMNDaysYermsn29n30MonthsExcessFraction
000342711-2109198Sun, Mar 19, -3774-14Iyar-17923337837053760711443.3573+51/143
1114433783376494-2075415Mon, Sep 16, -368279Cheshvan96522323366751458110953.2883+21/73
2223966119408830-2043079Thu, Mar 29, -3593167Iyar206023337837053760711443.3573+51/143
3338399902442613-2009296Fri, Sep 25, -3501260Cheshvan320423337837053760711443.3573+51/143
44527133685476396-1975513Sat, Mar 24, -3408352Iyar434822323366751458110953.2883+21/73
55622166021508732-1943177Tue, Oct 5, -3320441Cheshvan544323337837053760711443.3573+51/143
66766199804542515-1909394Wed, Apr 4, -3227533Iyar658722323366751458110953.2883+21/73
77861232140574851-1877058Sat, Oct 15, -3139622Kislev768223337837053760711443.3573+51/143
89005265923608634-1843275Sun, Apr 14, -3046714Iyar882623337837053760711443.3573+51/143
910149299706642417-1809492Mon, Oct 12, -2954807Cheshvan997022323366751458110953.2883+21/73
1011244332042674753-1777156Thu, Apr 25, -2865895Sivan1106523337837053760711443.3573+51/143
1112388365825708536-1743373Fri, Oct 22, -2773988Kislev1220923337837053760711443.3573+51/143
1213532399608742319-1709590Sat, Apr 20, -26801080Sivan1335322323366751458110953.2883+21/73
1314627431944774655-1677254Tue, Nov 1, -25921169Kislev1444823337837053760711443.3573+51/143
1415771465727808438-1643471Wed, May 1, -24991261Sivan1559223337837053760711443.3573+51/143
1516915499510842221-1609688Thu, Oct 28, -24071354Kislev1673622323366751458110953.2883+21/73
1618010531846874557-1577352Sun, May 10, -23181442Sivan1783123337837053760711443.3573+51/143
1719154565629908340-1543569Mon, Nov 7, -22261535Kislev1897523337837053760711443.3573+51/143
1820298599412942123-1509786Tue, May 7, -21331627Sivan2011922323366751458110953.2883+21/73
1921393631748974459-1477450Fri, Nov 18, -20451716Tevet2121423337837053760711443.3573+51/143
20225376655311008242-1443667Sat, May 16, -19521808Sivan2235823337837053760711443.3573+51/143
21236816993141042025-1409884Sun, Nov 13, -18601901Kislev2350222323366751458110953.2883+21/73
22247767316501074361-1377548Wed, May 27, -17711989Tammuz2459723337837053760711443.3573+51/143
23259207654331108144-1343765Thu, Nov 24, -16792082Tevet2574123337837053760711443.3573+51/143
24270647992161141927-1309982Fri, May 23, -15862174Sivan2688522323366751458110953.2883+21/73
25281598315521174263-1277646Mon, Dec 4, -14982263Tevet2798023337837053760711443.3573+51/143
26293038653351208046-1243863Tue, Jun 2, -14052355Tammuz2912423337837053760711443.3573+51/143
27304478991181241829-1210080Wed, Nov 30, -13132448Tevet3026822323366751458110953.2883+21/73
28315429314541274165-1177744Sat, Jun 12, -12242536Tammuz3136323337837053760711443.3573+51/143
29326869652371307948-1143961Sun, Dec 9, -11322629Tevet3250722323366751458110953.2883+21/73
30337819975731340284-1111625Wed, Jun 22, -10432717Tammuz3360223337837053760711443.3573+51/143
313492510313561374067-1077842Thu, Dec 20, -9512810Shevat3474623337837053760711443.3573+51/143
323606910651391407850-1044059Fri, Jun 19, -8582902Tammuz3589022323366751458110953.2883+21/73
333716410974751440186-1011723Mon, Dec 30, -7702991Shevat3698523337837053760711443.3573+51/143
343830811312581473969-977940Tue, Jun 29, -6773083Av3812923337837053760711443.3573+51/143
353945211650411507752-944157Wed, Dec 27, -5853176Shevat3927322323366751458110953.2883+21/73
364054711973771540088-911821Sat, Jul 9, -4963264Av4036823337837053760711443.3573+51/143
374169112311601573871-878038Sun, Jan 5, -4033357Shevat4151223337837053760711443.3573+51/143
384283512649431607654-844255Mon, Jul 4, -3113449Av4265622323366751458110953.2883+21/73
394393012972791639990-811919Thu, Jan 15, -2223538Shevat4375123337837053760711443.3573+51/143
404507413310621673773-778136Fri, Jul 15, -1303630Av4489523337837053760711443.3573+51/143
414621813648451707556-744353Sat, Jan 12, -373723Shevat4603922323366751458110953.2883+21/73
424731313971811739892-712017Tue, Jul 25, 513811Av4713423337837053760711443.3573+51/143
434845714309641773675-678234Wed, Jan 22, 1443904Shevat4827823337837053760711443.3573+51/143
444960114647471807458-644451Thu, Jul 21, 2363996Av4942222323366751458110953.2883+21/73
465184015308661873577-578332Mon, Jul 31, 4174177Elul5166123337837053760711443.3573+51/143
485407915969851939696-512213Fri, Aug 10, 5984358Elul5390023337837053760711443.3573+51/143
505636716645512007262-444647Sun, Aug 7, 7834543Elul5618822323366751458110953.2883+21/73
525860617306702073381-378528Thu, Aug 16, 9644724Elul5842722323366751458110953.2883+21/73
546084517967892139500-312409Mon, Aug 27, 11454905Elul6066623337837053760711443.3573+51/143
566308418629082205619-246290Fri, Sep 6, 13265087Tishrei6290523337837053760711443.3573+51/143
586537219304742273185-178724Sun, Sep 3, 15115271Elul6519322323366751458110953.2883+21/73
596646719628102305521-146388Wed, Mar 15, 16005360Nisan6628823337837053760711443.3573+51/143
606761119965932339304-112605Thu, Sep 11, 16925453Tishrei6743223337837053760711443.3573+51/143
616875520303762373087-78822Fri, Mar 11, 17855545Nisan6857622323366751458110953.2883+21/73
626985020627122405423-46486Mon, Sep 22, 18735634Tishrei6967123337837053760711443.3573+51/143
637099420964952439206-12703Tue, Mar 22, 19665726Nisan7081523337837053760711443.3573+51/143
64721382130278247298921080Wed, Sep 18, 20585819Tishrei7195922323366751458110953.2883+21/73
65732332162614250532553416Sat, Apr 1, 21475907Nisan7305423337837053760711443.3573+51/143
66743772196397253910887199Sun, Sep 29, 22396000Tishrei7419823337837053760711443.3573+51/143
677552122301802572891120982Mon, Mar 28, 23326092Nisan7534222323366751458110953.2883+21/73
687661622625162605227153318Thu, Oct 8, 24206181Cheshvan7643723337837053760711443.3573+51/143
697776022962992639010187101Fri, Apr 7, 25136273Nisan7758123337837053760711443.3573+51/143
707890423300822672793220884Sat, Oct 5, 26056366Tishrei7872522323366751458110953.2883+21/73
717999923624182705129253220Tue, Apr 17, 26946454Iyar7982023337837053760711443.3573+51/143
728114323962012738912287003Wed, Oct 15, 27866547Cheshvan8096423337837053760711443.3573+51/143
738228724299842772695320786Thu, Apr 13, 28796639Nisan8210822323366751458110953.2883+21/73
748338224623202805031353122Sun, Oct 25, 29676728Cheshvan8320323337837053760711443.3573+51/143
758452624961032838814386905Mon, Apr 23, 30606820Iyar8434722323366751458110953.2883+21/73
768562125284392871150419241Thu, Nov 4, 31486909Cheshvan8544223337837053760711443.3573+51/143
778676525622222904933453024Fri, May 3, 32417001Iyar8658623337837053760711443.3573+51/143
788790925960052938716486807Sat, Oct 31, 33337094Cheshvan8773022323366751458110953.2883+21/73
798900426283412971052519143Tue, May 14, 34227182Iyar8882523337837053760711443.3573+51/143
809014826621243004835552926Wed, Nov 11, 35147275Kislev8996923337837053760711443.3573+51/143
819129226959073038618586709Thu, May 10, 36077367Iyar9111322323366751458110953.2883+21/73
829238727282433070954619045Sun, Nov 20, 36957456Kislev9220823337837053760711443.3573+51/143
839353127620263104737652828Mon, May 19, 37887548Sivan9335223337837053760711443.3573+51/143
849467527958093138520686611Tue, Nov 16, 38807641Kislev9449622323366751458110953.2883+21/73
859577028281453170856718947Fri, May 30, 39697729Sivan9559123337837053760711443.3573+51/143
869691428619283204639752730Sat, Nov 26, 40617822Kislev9673523337837053760711443.3573+51/143
879805828957113238422786513Sun, May 26, 41547914Sivan9787922323366751458110953.2883+21/73
889915329280473270758818849Wed, Dec 7, 42428003Kislev9897423337837053760711443.3573+51/143
8910029729618303304541852632Thu, Jun 6, 43358095Sivan10011823337837053760711443.3573+51/143
9010144129956133338324886415Fri, Dec 3, 44278188Kislev10126222323366751458110953.2883+21/73
9110253630279493370660918751Mon, Jun 15, 45168276Sivan10235723337837053760711443.3573+51/143
9210368030617323404443952534Tue, Dec 13, 46088369Kislev10350123337837053760711443.3573+51/143
9310482430955153438226986317Wed, Jun 12, 47018461Sivan10464522323366751458110953.2883+21/73
94105919312785134705621018653Sat, Dec 23, 47898550Tevet10574023337837053760711443.3573+51/143
95107063316163435043451052436Sun, Jun 21, 48828642Tammuz10688423337837053760711443.3573+51/143
96108207319541735381281086219Mon, Dec 19, 49748735Tevet10802822323366751458110953.2883+21/73
97109302322775335704641118555Thu, Jul 2, 50638823Tammuz10912323337837053760711443.3573+51/143
98110446326153636042471152338Fri, Dec 30, 51558916Tevet11026722323366751458110953.2883+21/73
99111541329387236365831184674Mon, Jul 11, 52449004Tammuz11136223337837053760711443.3573+51/143
100112685332765536703661218457Tue, Jan 8, 53379097Tevet11250623337837053760711443.3573+51/143
101113829336143837041491252240Wed, Jul 8, 54299189Tammuz11365022323366751458110953.2883+21/73
102114924339377437364851284576Sat, Jan 19, 55189278Shevat11474523337837053760711443.3573+51/143
103116068342755737702681318359Sun, Jul 18, 56109370Tammuz11588923337837053760711443.3573+51/143
104117212346134038040511352142Mon, Jan 15, 57039463Tevet11703322323366751458110953.2883+21/73
105118307349367638363871384478Thu, Jul 28, 57919551Av11812823337837053760711443.3573+51/143
106119451352745938701701418261Fri, Jan 25, 58849644Shevat11927223337837053760711443.3573+51/143
107120595356124239039531452044Sat, Jul 24, 59769736Tammuz12041622323366751458110953.2883+21/73
108121690359357839362891484380Tue, Feb 3, 60659825Shevat12151123337837053760711443.3573+51/143
109122834362736139700721518163Wed, Aug 3, 61579917Av12265523337837053760711443.3573+51/143
110123978366114440038551551946Thu, Jan 31, 625010010Shevat12379922323366751458110953.2883+21/73
111125073369348040361911584282Sun, Aug 14, 633810098Av12489423337837053760711443.3573+51/143
112126217372726340699741618065Mon, Feb 10, 643110191Shevat12603823337837053760711443.3573+51/143
113127361376104641037571651848Tue, Aug 10, 652310283Av12718222323366751458110953.2883+21/73