Panchanga Shudhi

The five limbs of the Panchanga are supposed to represent the five sources of ethereal energy of which some are visible and others invisible and which when properly secured are said to conduce the health, wealth and prosperity of mankind.
Panchanga consists of Tithi, Vara, Nakshatra, Yoga and Karana. All these must be auspicious to successful fructification of any event.

Days
The 4th, 6th, 8th, 12th and 14th, full and new moon days should be avoided.

Vara
Thursday and Friday are held to be suitable for all works. Tuesday, is to be generally avoided except when it happens to be the 10th, 12th or 16th day of the child's birth when the child's Namakarana (baptising or giving name) may be performed.


Nakshatra
Bharani and Krittika should be avoided for all auspicious works as these two are said to be presided over by the god of death (Yama) and the god of fire (Agni) respectively.
In urgent cases if the Lagna could be fortified, the dosha due to nakshatra may get neutralised.
The last parts of Aslesha, Jyeshta and Revati should also be avoided.

Yoga The 6th (Atiganda). 9th (Soola). 10th (Ganda), 17th (Vyatipata) and 27th (Vydhruti) have deleterious effects upon events which are started or commenced under them.

Karana
The Karana chosen must be appropriate to the election in view. Thus Bava is auspicious for starting works of permanent importance while Taitila is propitious for marriage. Bhadra(Vishti Karana) is unfit for any good work but is eminently suitable for violent and cruel deeds. For getting initiation into kshudra mantras Sakuni Havana is propitious.

Therefore, Panchanga Suddhi means a good lunar day, a beneficial weekday, an auspicious constellation, a good yoga and a fertilising Karana.

Panchanga shudhi ensures the favorable results of any event. The event will meet with success so long as the Panchanga components are favorable, the Panchanga lords are well-disposed, the Vara/Tithi/Nakshatra Yoga is favorable, on the other hand, the panchanga components and their lords are unfavorable.
If the Panchanga components had all been favorable, then these neutralizations of blemishes
"Panchanga Suddhi" means that Day, Nakshtra, Thithi, Yoga and Karana are all auspicious at a particular time

To calculate "Panchanga Shuddhi" Manually , there are Panchanga Shuddhi Chakaras (Tables)

1 Day/Nakshtra Table (only the Siddhi, Subha, and Amrita conditions are auspicious)  

Nakshtra1234567
 SundayMonTuesWedThursFriSat
AsvidaSidhiAvaAmritha,MaraShubhaAvaShubha
BernaDadgdhaShubhaAvaKanaShubhaAvaAva
KethiAvaShubhaShubhaSiddhiYamaShubhaShubha
RehanaShubhaShubhaShubhaSubhaUthpathaShubhaShubha
Murgash.ShubhaSiddhiAvaAmurthaMaraShubhaAva
AdhaAvaAvaShubhaAvaKanaShubhaAva
Punar.ShubhaAvaShubhaShubhaSiddhiAvaShubha
PushaShubhaShubhaShubhaShubhaSubhaUthpathaShibha
AslisaAvaShubhaSidhiAvaAmurthaMaraShubha
MaAvaAvaAvaShubhaAvaKanaShubha
Pu.ShubhaShubhaAvaShubhaShubhaSiddhiAva
Ut.ShubhaShubhaShubhaShubhaShubhaShubhaUthpatha
HasthaShubhaAvaShubhaSiddhiAvaAmurthaMara
ChitraShubhaDagdhaAvaAvaShubhaAvaKana
SaAvaShubhaShubhaAvaShubhaShubhaSiddhi
VisaUthpathaShubhaShubhaShubhaShubhaShubhaShubha
AnuraMaraShubhaAvaShubhaSiddhiAvaAmurtha
DetaKanaShubhaAvaAvaAvaShubhaAva
MulaSidhiAvaShubhaShubhaAvaShubhaShubha
Puva.ShubhaUthpathaShubhaShubhaShubhaShubhashubha
UtraAmurthaMaraShubhaAvaShubhaSiddhiAva
SuvanaShubhaSidhiAvaShubhaShubhaAvaShubha
DenataShubhaSubhaUthpathaShubhaShubhaShubhaShubha
SiyawasAvaAmurthaMaraShubhaAvaShubhaSiddhi
PurvabadShubhaAvaKanaShubhaAvaAvaAva
UthraB.ShubhaShubhaSiddhiAvaShubhaShubhaAva
RevathiShubhaShubhaShubhauthpathaShubhaAvaShubha

Ex. If Ashwini Nakshtra Falls on a Sunday then it is called Siddhi which is Auspicious 
but if the same Nakshtra on a Monday is not good (Ava)


2Day /Thithi Table (Here also Shubha, Amrit and Siddhi conditions are good others bad)

Thithi (Shukala/Krishna) SundayMondayTu.Wed.Th..FriSat
1PartipatAmurthaShubhaAmritSanvruthiShubhaSiddhiShubha
2DavityaShubhaAmritShubhaVishaShubhaAmritShubha
3 ShubhaShubhaSidhiDagdhaShubhaShubhaShubha
4 VishaRikthaRikthaRikthaAmritRikthaSiddhi
5 ShubhaShubhaDagdhaShubhaSiddhiShubhaAmrit
6 AmritVishaAmritGidraDagdhaSiddhiKrakava
7 SamvruthiAmritVishaSidhiShubhaKrakavaVisha
8 ShubhaShubhaSiddhiAgniVishaDagdhaShubha
9 RikthaRikthaRikthaKrakavaAgniRikthaDagdha
10 ShubhaShubhaKrakavaShubhaSiddhiAgniAgni
11 AmritKrakavaAmurthaShubhaShubhaSiddhiAgni
12 AgniAmritShubhaSiddhiShubhaAmritShubha
13 ShubhaShubhaSiddhiAmritShubhaShubhaShubha
14 RikthaRikthaRikthaRikthaAmritRikthaSiddhi
15Full Moon Day (purnima) shubhaShubhaShubhaShubhaSiddhishubhaAmrit
16 Amavasya (No Moon) Not GoodNot GoodNot GoodNot GoodNot GoodNot GoodNot Good

Ex. If Krishna or Shuka Thithi 1 (Partipat) falls on a Sunday then the condition is called Amrit (Good)


3. Yoga
Following are Bad yogas :
Vishkamba, Athiganda, Shula, Druma, Ganda, Viyagatha, Vajra Viyathipatha, Parogha, Vidruthi

4. Karana
Vishti , Shakuna, Chatuspada , Nagha, and Kistunga are Bad


DAGDHA THITHIS TO AVOID ACCORDING TO THE SUN'S POSITION IN CONSTELLATIONS

1. When Sun is in Mesha (Aries) avoid 6th Tithi (Dagdha) - Usually Sun is in Aries (Mesha) from 14th April to 14th May and in between there are 26th Tithis One is waxing and other is waining , even if the Panchanga Shuddhi occours , those are invalid as it was cancelled due to Sun's position.
Other Dhagdha Thithis,
15th May to 14th june (Vrushaba Sun) 4 th thithies
Mithuna Sun 8 th thithies
Simha Sun 10th
Thula Sun 12th thithies
Dhanu Sun 2nd
Kataka Sun- 6th
Kumbha Sun 4th
Kanya Sun 8th
Vrushika Sun 10th
Makara Sun 12th
Meena Sun 2nd